How To Use Volcanic In A Sentence

The volcanic pile built up above sea level so that lavas began to be erupted subaerially.
The chief natural phenomena that have driven fragmentation are glacial advances, volcanic activity, geologic faulting, tectonic movement, mass land slumping, serpentinization, major sea level rise and climate oscillation. Habitat fragmentation
For 10,000,000 years during the Miocene, Pliocene and Pleistocene epochs this area was a fiery inferno of constant volcanic activity and magnificent giants such as the Grizaba, La Malinche, Iztaccihuatl, Popocatepetl, Volcan de Toluca and Volcan de Colima, along with thousands of smaller volcanic cones, came into eruptive existence. The geology and geography of Lake Chapala and western Mexico
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Vast clouds of volcanic dust were shot into the stratosphere and swept around the globe. Times, Sunday Times

These details are important for geodynamical modeling, which may one day predict complex geological processes such as earthquakes and volcanic eruptions. PhysOrg.com - latest science and technology news stories
The presence of extrusive volcanic rocks during the rifting stages suggests that a large volume of melt may also have been added to the crust intrusively.
We conclude that similar compositional bimodality among eruptive products of intracontinental volcanoes in volcanic fields may be the rule, rather than the exception.
To test the theory of a chemoautotrophic origin of life in a volcanic, hydrothermal setting, we explored mechanisms for the buildup of bio-organic compounds by carbon fixation on catalytic transition metal precipitates. Dawkins on the OOL
These islands are rugged, eroded remnants of great volcanic cones. Macrosociology: An Introduction to Human Societies
Deep growls and explosions thundered through the air as clouds of black volcanic ash coated the surroundings.
The Los Zorros property covers the entire breadth of a regional anticlinorium in an area that is the locus of younger intrusive activity which intruded up through the fold-deformed lower Cretaceous section of volcaniclastic, siliclastic, and limestone formations and intrusive diorite sills. StreetInsider.com News Articles
But, as it turns out, pioneering research into volcanic lightning is making his sparker seem not so crazy after all, and now a new generation of scientists believe volcanoes may offer up clues to the process of preparing the Earth for life. First Contact
Porous volcanic rock called pumice and Southern pine bark. Dispatch.com: RSS
To achieve this goal we map the spatial distribution of volcanic seismic facies units.
The northern margin of the melange is marked by a thrust contact with both the Carboniferous sedimentary rocks and extrusive volcanic sequence.
They are subject to periodic earthquakes and volcanic activity that can destabilize them.
The mountainous Mid-Coastal Sedimentary ecoregion lies outside of the coastal fog zone and is typically underlain by massive beds of sandstone and siltstone in contrast to the volcanics of Ecoregion 1d. Ecoregions of Oregon (EPA)
During the middle to late Tertiary Period, dikes, sills, and small irregular bodies of mafic to silicic igneous material were intruded into the bedded sedimentary and volcanic rocks.
Sornette's discussion of the science of earthquakes, volcanic eruptions, hurricanes, tornadoes and meteorite impacts is riveting.
The rocks are argillaceous, sericitic and chloritic, metamorphosed slates and schists, sedimentary pre Jura-trias slates, and ancient devitrified volcanic rocks. North Carolina and its Resources.
In fact, the great plutonic action is confined to the central portion of the island; there, rocks of the trappean and volcanic class, including trachyte, basalt, and tuffs and agglomerates associated with streams of lava, have made this a land of supernatural horrors. Journey to the Interior of the Earth
These features can be explained if a volcanic island arc was approaching from that direction. THE EARTH: An Intimate History
R.B. Smith and A.R. Lowry, 2009, Density and lithospheric strength models of the Yellowstone-Snake River Plain volcanic system from gravity and heat flow data, J.Vol. Geotherm. Scientific Articles on Yellowstone
Banana plantations and forests give way to volcanic cones and lava fields. Times, Sunday Times
Bamburgh Castle, in Northumberland, which sits on a volcanic outcrop overlooking the North Sea, was in joint eighth place.
The Park consists of two geomorphic units: rift valley volcanic mountains and Congo basin low highlands. Kahuzi-Biéga National Park, Democratic Republic of Congo
We searched other major valleys sporting outcrops of the same volcanically derived sedimentary rocks, which are exposed across thousands of square kilometers of mountainous terrain.
This caused thermal uplift of Scotland and the East Shetland platform and volcanic activity.
The volcanic successions comprise thick piles of basaltic lavas and subordinate intermediate and silicic lavas and pyroclastics.
The circulation of fluids that forms this new class of hydrothermal vents is driven by heat generated when seawater reacts with mantle rocks, not by volcanic heat.
The plotline is pleasantly, pulpily thin: college kids invade a sun-and-sex spring break spot, a volcanic eruption unleashes a swarm of flesh-eating prehistoric piranhas. Jessica Szohr Reveals Why She ‘Freaked Out’ While Filming ‘Piranha 3-D’ » MTV Movies Blog
The rich volcanic soil had once more encouraged the growth of a prosperous people, who had spread over vulnerable areas. THE EARTH: An Intimate History
This volcanic neck is located a few miles south of Tuff Canyon on the west side of the road.
The original inhabitants carved them from soft volcanic rock and almost all are positioned around the coast facing inland. Times, Sunday Times
More majestic, in central North Island, was a flight over volcanic territory.
In practice pyroclastic and volcaniclastic rocks include all the products of extrusive volcanic activity except lava flows.
Mineralogically, these oil shales are marls or argillaceous limestones, which may be associated with volcanic tuffs and evaporites. The Democratic Party's email attacking Jerome Corsi (author of the #1 selling anti-Obama book).
A major source of iron, called iron laterite, is a type of residual deposit generated by the intense weathering of iron-rich rocks such as mafic and ultramafic volcanic rocks.
Fragments of granite have been observed at Teneriffe; the island of Gomora, from the details furnished me by M. Broussonnet, contains a nucleus of micaceous schist: — the quartz disseminated in the sand, which we found on the shore of Graciosa, is a different substance from the lavas and the trappean porphyries so intimately connected with volcanic productions. Travels to the Equinoctial Regions of America
Several days might be profitably spent by the antiquarian in investigating the contents of the different tiers of galleries; while the geologist would find matter for interesting speculation in the partial intrusion of the older lithoid tufa here and there into the softer and more recent volcanic deposits in which the passages are excavated, and in which numerous decomposing crystals of leucite may be observed. Roman Mosaics Or, Studies in Rome and Its Neighbourhood
Sometimes volcanic necks are locally referred to as a butte.
The wall rocks to the pegmatites consist of a sequence of mafic volcanics and gabbroic intrusive bodies. Marketwire - Breaking News Releases
It has its own yoga and massage room hewn from volcanic rock, while the more active can take part in cycling, surfing and photography classes. Times, Sunday Times
The Islands 'volcanic landforms represent classic features in the continuing study of vulcanology world-wide. Aeolian Islands, Italy
A technological revolution occurred when the traditional method of building in stone was replaced by stronger, more flexible, and cheaper concrete construction, with the discovery of pozzolana mortar made from volcanic stone. B. Economy, Society, and Culture
You drink in the bright blue sky and sheer volcanic peaks as though they were your final sight on earth. Times, Sunday Times
Fagatele Bay National Marine Sanctuary comprises a fringing coral reef ecosystem nestled within an eroded volcanic crater on the island of Tutuila, American Samoa. Fagatele Bay National Marine Sanctuary
The steep, mountainous Volcanic Subalpine Forests ecoregion is composed of volcanic and igneous rocks, predominately andesitic with areas of basalt. Ecoregions of Colorado (EPA)
Volcanoes of the western Hungarian volcanic field also consistently comprise basal glassy pyroclastic units overlain by lavas that cap buttes.
Small vesicular pieces of volcanic material, scoria, collect around the vent to form a cinder cone.
The carrier of the modified filter medium is the volcanic rock coated with a polycondensate modifier.
The allochthonous units that overlie the eastern part of this terrane were probably emplaced when the Magnitogorsk volcanic arc collided with this margin in late Devonian times.
In answer to your question about how the water vapour gets that high, water vapour is thrown into the stratopause by volcanic eruptions and remains trapped.
Between the outer-arc ridge and the volcanic arc a forearc basin may be formed.
Even scarier and more destructive than volcanic mudflows are pyroclastic flows or glowing avalanches.
The volcanic stone is subject to weathering, and intensive conservation efforts are needed to help preserve Rapa Nui's stone legacy in its present, awe-inspiring state.
And whereas, its decision made, the Assembly passed on to pressing metropolitan business, the impact on the colony itself was volcanic.
Others, called volcanic earthquakes, are usually shallower and can be precursors to volcanic eruptions and intrusions of magma.
The Southern Highland Group, consisting of greywacke, shale, limestone and volcanic rock, forms the top of the Dalradian succession.
Depending on the proportion of water to volcanic material, mudflows can range from soupy floods to thick flows that have the consistency of wet cement.
The volcanic cloud gradually swept around the northern hemisphere as a thin veil of dust and acid. Times, Sunday Times
Katrina R. DeNosaquo, Robert B. Smith, Anthony R. Lowry, 2009, Density and lithospheric strength models of the Yellowstone-Snake River Plain volcanic system from gravity and heat flow data Scientific Articles on Yellowstone
The place was recently visited by a serious volcanic eruption.
The actual volcanic crater is one of the largest in the world as the town of Soufriere is neatly nested into the land based half, while the other portion lies under water and extends northward in the direction of Martinique's Soufiere.
For some nature lovers, the craggy, volcanic landscape of Iceland is a paradise.
At the local warning center a seismometer (an instrument which measures the direction and force of eruptions) will provide accurate recordings of volcanic activity.
This self-governing Australian external territory juts out, like a green volcanic periscope that has risen in mid-ocean for a look-see, approximately half way between Australia and New Zealand.
Continued growth increases the risk of partial dome collapse, which could trigger moderate explosions and possibly significant lahars (volcanic mudflows) from the crater.
Chapter 3 Volcanic eruptions are difficult things to classify.
Between 30 and 40 million years ago, eruptions from a cluster of stratovolcanoes blanketed the area with ash beds and volcanic mud flows, reaching a maximum thickness of 3,000 feet.
Natural sources of emissions of sulfur dioxide include volcanic eruptions and forest fires.
From here, millions of years ago, volcanic eruptions spilled lava over the land.
Individual volcanoes of continental monogenetic volcanic fields are generally presumed to erupt single magma batches during brief eruptions.
Hence, these volcanic pipes are found to have diamonds in them.
In 1949, both basanite and tephrite were ejected during a single, 5 week long eruption that formed monogenetic cones and lava flows on the volcanic island of La Palma, Canary Islands.
The Romans learned that when pozzolana, a powdery volcanic ash imported from Pozzuoli, ancient Puteoli, was mixed with lime and water it makes a tenacious binding material that sets and endures in salt or fresh water. Portus Cosanus
Passing through plumes of evil-smelling sulphurous smoke and steam, they finally encountered daylight, and emerged from the gaping maw of a volcanic cone.
All the islands were formed by volcanic activity and can be divided into atolls and high islands.
It was still memorable to see the shifting shadows and scuds of rain across the lake and the green volcanic hills - and it all lit up with sunshine and breathtaking scenery on the final day.
The Japanese archipelago is located on the so-called Pacific Rim of Fire, a large active volcanic and tectonic zone ringing North and South America, Asia and island arcs in Southeast Asia.
This subsection consists mostly of folded, faulted, and generally metamorphosed sediments and volcanics of the Franciscan Complex and less extensive Cretaceous sediments of the Great Valley Sequence. Leeward Hills (Bailey)
Vast clouds of volcanic dust were shot into the stratosphere and swept around the globe. Times, Sunday Times
In addition, volcanic rocks and intrusions of this age are distributed widely around the western and southern perimeter of the basin.
A dominant landform near the Cuesta College campus is the chain of volcanic necks known as the Morros or the Seven Sisters.
Favorable reservoirs may be composed of sandstones, conglomerates basement metamorphic buried hills, and volcanic rocks.
In particular he studied magma flow beneath the Earth's surface to obtain a better understanding of volcanic eruptions when magma flows through fractures in the Earth's surface.
Its form may imitate volcanic cones such as can be seen in the Tuxtla Mountains only 100 km to the west.
Iceland is riven by volcanic activity. Times, Sunday Times
These islands are rugged, eroded remnants of great volcanic cones. Macrosociology: An Introduction to Human Societies
These machines are about six feet high in the whole, made of a rough gray volcanic stone, full of large crystals of leucite. Museum of Antiquity A Description of Ancient Life
Aaron Slate, phyllite, metasiltstone, metatuff, felsic volcanic rocks, and Virgilina Greenstone underlie Ecoregion 45c in Virginia. Ecoregions of Delaware, Maryland, Pennsylvania, Virginia, and West Virginia (EPA)
The Romans invented concrete, mixed from pozzolana, a volcanic ash mined on the slopes of Mount Vesuvius, which forms a natural cement when combined with lime.
They could be likened to the dynamic force of a volcanic eruption.
Built of uniformly gray, granular volcanic tufa, or peperino, the courtyard was completed by 1579, as recorded in the building documents.
The newfound vents are home to a menagerie of creatures adapted to darkness and crushing water pressures, species that thrive despite waters volcanically heated to near boiling.
The whole vast plain in which it "towers alone," is covered with the evidences of volcanic action; can it then, in one of those tremendous efforts of nature, which scattered these fragments of rock over so great an extent, have been upheaved from the bed of the earth, and left as a monument of some mighty convulsion? Life in the Rocky Mountains
Deep growls and explosions thundered through the air as clouds of black volcanic ash coated the surroundings.
However, whereas volcanic activity ceased on the Moon several billion years ago, Io still has about a dozen volcanoes erupting at any one time.
The Lesser Antilles are the island peaks of a 700 km-long volcanic arc of 18 volcanoes, overlying a tectonic plate subduction (under-thrusting) zone. Pitons Management Area, Saint Lucia
I found a mass of crystals of the greenish volcanic glass, called olivine, imbedded in a piece of phonolite which looked as blue and fresh as if only quarried yesterday. The Hawaiian Archipelago
Each statue was hewn out of hard volcanic material from quarries near the Rano Raraku volcano.
The high level of radiation in the rocks implies that they are volcanic in origin.
The Median Tectonic Zone, which separates the Western and Eastern Provinces, is a narrow belt of Late Palaeozoic and Mesozoic plutonic rocks with minor volcanic and metasedimentary units.
These were probably caused by volcanic eruptions or geysers.
Mohammad Ali/EPA A woman was seen inside a rescue vehicle covered in volcanic ash in Sidorejo Village, Klaten, Central Java. Volcano Erupts in Indonesia
They were made of volcanic pumice stone, ribbed with whalebone ivory and studded with gold. WATER TRILOGY # 1: ASCENSION
There is no doubt in my mind at all that volcanic eruptions of biblical proportions have occurred many times in the history of this planet.
The mountain ranges (sky islands) are a geologic mix of Tertiary volcanic and intrusive granitic rocks, Paleozoic sedimentary layers, and some Precambrian granitic plutonic rocks. Ecoregions of New Mexico (EPA)
These include rapid snowmelt, water-level changes, volcanic eruptions, earthquakes, and excessive rainfall.
Some rocks have basaltic compositions similar to the well-studied meteorites thought to have come from Mars, but other rocks are more like the volcanic rock andesite.
Water, carbon dioxide, and sulphurous gases are common volcanic gases.
It is a sea mountain, blasted by volcanic forces more than a mile up from the ocean floor, and stretching underwater for nine miles.
Magmas erupted in continental volcanic arcs typically contain components from many sources in the crust, lithospheric mantle and asthenosphere.
The rock is volcanic in origin.
According to Tinka Resources Ltd., press release dated January 24, 2007, mapping and prospecting has outlined a 1,000 by 800 metre area hosted by granodiorite and quartz monzonite of the Coastal Batholith which intruded Jurassic and Cretaceous sediments and volcanic. Marketwire - Breaking News Releases
There have been several volcanic eruptions this year.
All around the stunning, perched towns of Pitigliano, Sovana, and Sorano run hidden hiking trails carved from volcanic rock by the pre-Roman Etruscans. The Other Tuscany
However, water vapor is consistently the most common volcanic gas, normally comprising more than 60% of total emissions. The BBC and global warming
Most earthquakes and volcanic eruptions do not strike randomly but occur in specific areas, such as along plate boundaries.
FEMA/USGS, 1999, Volcanic ashfall: How to be prepared for an ashfall. Actions to take for ash fall?
Water cascades over the yellow rocks and soil of the Galway Soufriere volcanic vent.
A great dome of rock juts up sheer from the road and the surrounding mountains are volcanic in origin and crazy in outline. Time travellers
EXPERTS have found evidence of a volcanic eruption that led to mass extinction 260 million years ago. The Sun
It's a conglomerate of three houses opened to one another and built in the old style - with arches, tufa (soft volcanic stone) and many stairs.
The andesitic volcanic material has higher nutrient content and water holding capacity than the rhyolitic soils of the neighboring Yellowstone Plateau (17j). Ecoregions of Wyoming (EPA)
Engine companies carry an oil pick up absorbent product that is a pumicite volcanic ash derivative. Firehouse.com: In The Line Of Duty
Armenia is a rugged, volcanic country with rich mineral resources.
Thirty-six million years ago, volcanic mudflows blocked a stream flowing through this valley, producing a lake about twelve miles long.
Where oceanic lithosphere is subducted beneath another oceanic part of a plate the associated volcanic activity and produce an intra-oceanic island arc.
Ahead and to the right were rolling miles of a pahoehoe sea, bounded by the unseen Pacific 3,000 feet below, with countless craters, fissures emitting vapour, and all other concomitants of volcanic action; bounded to the north by the vast crater of The Hawaiian Archipelago
The nature of the degassing process within a volcanic edifice is critically important to the nature of eruptions, whether explosive or effusive, from the volcano.
Climbers had been daunted by this 1,700-foot volcanic neck for years; at least one had died trying to reach the top.
Nestled within these bleak volcanic highlands are fertile valleys filled with game plentiful enough to satisfy even the appetites of dragons.
We saw the different climates in the north and south of the island, we saw the inhabited volcanic caves and the multicoloured rocks, rich in different minerals.
The fango is made of pure volcanic ash, and removes impurities, replaces minerals and gently exfoliates the skin.
We are ignorant of the extent of the cavities which subterranean fires and volcanic agitations may have produced in the bowels of the earth in those primitive rocks, which, containing considerable quantities of amphibole, mica, garnet, magnetic iron-stone, and red schorl (titanite), appear to be anterior to granite. Travels to the Equinoctial Regions of America
If you want to explain the effects of volcanic dust, you have to quantify both the dust's scattering of sunlight and its absorption of solar energy. Ice Time: Climate, Science, and Life on Earth
One way to do just this would be to detect the on-going production of hydrocarbons such as propane which cannot be produced by volcanic activity.
For 25 million years andesitic volcanic ashflows and mudflows were common, covering and petrifying forests: nearly 200 species of petrified plants have been found. Yellowstone National Park, United States
Higher, steeper slopes of the Vosges have thin topsoil, with subsoils of weathered gneiss, granite, sandstone, schist, and volcanic sediments.
We were passing through scrub and volcanic rock, pine trees. Times, Sunday Times
The older sample, a stratiform volcaniclastic layer (Hans-Platte) is collected from Bundenbach (Hunsrück), the type locality of the Lower Emsian Hunsrück Slate.
Montmorillonite is a swelling clay formed from the degradation of silicates such as feldspars, volcanic minerals, chlorite and illite, and is commonly found in alkaline soils today.
Aquatic animals have long used wood, pumice from volcanic eruptions, coconut shells, and the like as mobile homes for transport.
Finally volcanic rocks spread over its surface as the Slave protocontinent was rifted apart about 2.8 billion to 2.7 billion years ago.
Two main types of pyroclastic surges occurred at Taapaca Volcanic Complex.
Old lava flows and beds of volcanic ash underlie the surface of much of this part of Colorado.
And the funny thing, as admitted to myself, was that evolution teaches in no uncertain voice that man did run on all fours ere he came to walk upright, that astronomy states flatly that the speed of the revolution of the earth on its axis has diminished steadily, thus increasing the length of day, and that the seismologists accept that all the islands of Hawaii were elevated from the ocean floor by volcanic action. The Water Baby
It has 8,000 kilometres of shores going from sand dunes to volcanic headlands.
That volcanic energy erupted about 20 or 30 years ago when he discovered that there existed a hydrogen bomb capable of destroying mankind. Times, Sunday Times
Located at the southern tip of the Korean peninsula, Cheju has been shaped by volcanic lava.
The 2009 drilling program identified widespread gold mineralization associated with mineralized and altered dacite porphyry and adjacent sedimentary and volcanic rocks, drill hole DDH09-014 revealed gold mineralization of 111 meters grading up to 7.28 grams/tonne. Marketwire - Breaking News Releases
Their bipedality is dramatically confirmed by the poignantly evocative set of footprints discovered by Mary Leakey in fossilized volcanic ash. THE GREATEST SHOW ON EARTH
The prediction of favorable volcanic reservoir with few drilling data is preliminary achieved in this study.
The structure called the Ries (or Rieskessel) is the subject of some controversy-one school of thought accepting it as an astrobleme, while another holds it to be the result of a cryptovolcanic explosion that brought to the surface "meteoritelike" materials. The Golden Torc
The display of volcanic pyrotechnics was powerful enough to earn the mountain national park status two years later.
The rich volcanic soils of the foothills and mountains are some of the best in the country.
The plateau of Düzen and the neighbouring Zençirli Tepe (mountain) both consist of beige limestone, overlying ophiolitic mélange (a volcanic rock). Archaeometrical Study of Craft Activities « Interactive Dig Sagalassos – City in the Clouds
South is the desert and further south-east are more mountains with desolate plateaux and volcanic cones and craters.
Pressure has hardened the marine muds, the arkose, or the volcanic ash from which slates are derived, and has caused them to cleave by the rearrangement of their particles. The Elements of Geology
The Tanzania-Malawi system includes the crystalline Eastern Arc mountains and volcanic mountains to the south-west.
It is underlain by sedimentary and metamorphic rock in contrast to the adjoining Cascades which are composed of volcanics. Ecoregions of the United States-Level III (EPA)
God; in fact, "isles" are mountains upheaved from the bed of the sea by volcanic agency; only that he seems here to have passed from unintelligent creatures (Isa 40: 12) to intelligent, as nations and lands, that is, their inhabitants. Commentary Critical and Explanatory on the Whole Bible
But the aircraft is hijacked by the pilots and flown to a deserted volcanic island. The Sun
The miles upon miles of open gray-green country, treeless, hedgeless, houseless, swoop toward one another with the strangest sinuosities and rifts and knobs of volcanic earth, till at last they sink in faint mists, only to rise again in pink and blue distances, so far off, so pale and aërial, that they can scarcely be distinguished from the atmosphere itself. Lippincott's Magazine of Popular Literature and Science Volume 17, No. 102, June, 1876
Then climb twisty roads into the island's lush volcanic interior. The Sun
Others held that meteorites were more immediately terrestrial in origin, being akin to volcanic bombs ejected by violent eruption events.
On this account, whatever might have been the cause of the earthquake, whether volcanic or electrical, the movement assumed every possible direction -- vertical, horizontal, oscillatory, vorticose, and pulsatory; producing every variety of destruction. The Book of Enterprise and Adventure Being an Excitement to Reading. for Young People. a New and Condensed Edition.
Among the phenomena that permanent observatories can study are climate variability and volcanic activity.
The vesicular nature of the products is typical of plinian eruptions in the Taupo Volcanic Zone, with rapid bubble formation and degassing occurring during eruption.
The oyamel firs have held their ground on these volcanic hillsides for eons, and Mexico-bound monarchs will spend the winter nowhere else.
Grant and most of the other southern micros are nonvolcanic, all sedimentary rock. Perseus Spur
The doughty Icelanders know that they have only squatters' rights on their volcanic island. Times, Sunday Times
Volcanic activity has created thermal springs and boiling mud pools.
For most large deposits of agate or silicified wood, silica was derived from the decomposition of volcanic rocks.
French Polynesiaincludes five archipelagoes (4 volcanic, 1 coral); Makatea in French Polynesia is one of the three great phosphate rock islands in the Pacific Ocean - the others are Banaba (Ocean Island) in Kiribati and Nauru Geography-note
Volcanic scenery is by no means confined to what we call the volcanic national parks. The Book of the National Parks
The age of the tuff collected from bedded volcanic rocks newly exposed in the quarry at Bardon Hill is less easy to interpret.
In this case, it is the formation of the rock through volcanic activity, which drives off any argon formerly present.
The amphibolite, a metamorphosed black volcanic rock, formed from lavas that spilled on the floor of a shallow sea, mixing with layers of mud, sand, and volcanic ash. Ecoregions of North Carolina and South Carolina (EPA)
The mine workings occupy much of the west side of an isolated low hill composed mainly of light-colored volcanic rock, described as felsite porphyry or trachyte, highly altered to clay minerals.
These sedimentary rocks contain a high percentage of volcanic ash that provides the barium necessary for barite formation.
There are many deposits of natural volcanic pozzolana or trass in Java, which, when mixed with locally produced lime, gives a hydraulic cement. Chapter 9
In a matter of days, if not hours, the little indentation in the middle of my belly is going to erupt in a volcanic burst of nubbly flesh, and all at once I will be sporting the dreaded pregnant belly button.
Yes, flying through the plume of a volcanic eruption can be dangerous. Times, Sunday Times
A comprehensive geophysical prediction shows that the volcanic rock in the whole area extends as strips.
Continental monogenetic volcanic fields are subject to the same physical constraints as other volcanic systems.
This lagune is probably formed in the basin or crater of some extinct geyser or volcanic spring, as the two high and wonderfully similar mountains on either side are identical in formation with those in which occur the cave-craters farther south on the same river. Zuñi Fetiches Second Annual Report of the Bureau of Ethnology to the Secretary of the Smithsonian Institution, 1880-1881, Government Printing Office, Washington, 1883, pages 3-45
These minerals occur in amygdaloidal cavities and in nodules in intermediate composition volcanic rocks of the Conejos Formation.
Various architectures connecting extrusive mud volcanic cones to their underlying source layer have been described, ranging from bulbous diapirs to steep diatremes and narrow vertical pipes.
Compositionally, the turbidites are mostly feldspathic litharenites with trace amounts of serpentinite, anorthosite and mafic volcanic clasts.
It therefore follows that all sedimentary bodies, other than deep sea oozes and volcanic ash deposits, are likely to be diachronous.
Tsunamis are waves formed when huge masses of water are displaced by undersea volcanic eruptions or earthquakes.
Large areas of island are covered with thick deposits of black volcanic ash, known locally as picon.
So volcanic rocks are composed of only a few mineral groups, each group having its own characteristic atomic structure.
Sandstone reservoir and volcanic rock distribute alternately, their thicknesses are negative correlation.
The ridge consists entirely of volcanic rock.
Although type 1 Mg-smectite may be derived from tektitcs, or volcanic glass, there is strong evidence that the smectite spherules are of tektite origin.
One hundred million years ago Tobago was in the Pacific, part of a chain of volcanic islands.

How To Use Volcanic In A Sentence

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