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Topic: Dormant volcano

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  Volcano - LoveToKnow 1911
VOLCANO, an opening in the earth's crust, through which heated matter is brought, permanently or temporarily, from the interior of the earth to the surface, where it usually forms a hill, more or less conical in shape, and generally with a hollow or crater at the top.
The volcanoes of central France are regarded as extinct, inasmuch as no authentic historical record of any eruption is known, but there are not wanting signs that in some parts of this volcanic region the subterranean forces may yet be slumbering rather than dead.
Most of the lavas from the volcanoes of South America consist of hypersthene-andesite, and it is notable that the fragmental ejectamenta from the eruptions of St Vincent and Martinique in 1902 and from Krakatoa in 1883 were evidently derived from a magma of this Pacific type.
www.1911encyclopedia.org /Volcano   (17789 words)

 Dormant volcano - Wikipedia, the free encyclopedia
A dormant volcano is a volcano which is not currently erupting, but is believed to still be capable of erupting in the future.
Volcanoes can be dormant for hundreds or thousands of years and are usually eroded and warn down, due to the lack of eruptions.
The eruptions from a dormant volcano are usually very violent, because the plug inside the volcano stops the lava from coming out of the vent for a very long time and builds pressure.
en.wikipedia.org /wiki/Dormant_volcano   (149 words)

 Activity   (Site not responding. Last check: 2007-11-05)
A dormant or sleeping volcano is a volcano that has been quiet for a long time, but still has signs it may erupt again.
A volcano becomes dormant when the vent is blocked by hardened lava, called a plug, or if the magma seeps back under the earth’s crust.
In 1943 a volcano growing in the middle of a flat cornfield in Mexico was discovered.
volcano.und.nodak.edu /vwdocs/kids/volcano_project/activity.html   (289 words)

 Maui Air-Volcano Air Tours - (808) 877-5500 The Best way to see the Active Volcanoes on the Big Island of Hawaii ...
The primary volcanoes on each of the islands are known as shield volcanoes, which are gently sloping mountains produced from a large number of generally very fluid lava flows.
The age trend of the volcanoes is thought to be due to the way in which the islands are built on the moving sea floor of the North Pacific Ocean.
The volcano is mantled with young and old lava flows and is actively venting hydrothermal fluids at it's summit and south rift zone.
www.volcanoairtours.com   (3631 words)

A dormant volcano is one that has not shown eruptive activity within recorded history, but shows geologic evidence of activity within the geologic recent past.
These are perhaps the most dangerous volcanoes because people living in the vicinity of a dormant volcano may not understand the concept of geologic time, and there is no written record of activity.
Studies of the geologic history of a volcano are generally necessary to make an assessment of the types of hazards posed by the volcano and the frequency at which these types of hazards have occurred in the past.
earthsci.org /processes/geopro/volc/volc.html   (8257 words)

 Natural Disasters - Volcano
Dormant volcano's are currently not active but could possibly erupt again.
Volcano's don't necessarily have to be on earth.
Lava from volcano's is acidic and therefore is a contribution towards acid rain.
www.projectshum.org /NaturalDisasters/volcano.html   (265 words)

 USGS Photo Glossary: Volcano
A volcano is a vent at the Earth's surface through which magma (molten rock) and associated gases erupt, and also the cone built by effusive and explosive eruptions.
Scientists usually consider a volcano active if it is currently erupting or showing signs of unrest, such as unusual earthquake activity or significant new gas emissions.
Dormant volcanoes are those that are not currently active (as defined above), but could become restless or erupt again.
volcanoes.usgs.gov /Products/Pglossary/volcano.html   (375 words)

 Volcanic and Geologic Terms
Compound Volcano: A volcano that consists of a complex of two or more vents, or a volcano that has an associated volcanic dome, either in its crater or on its flanks.
Dormant Volcano: Literally, "sleeping." The term is used to describe a volcano which is presently inactive but which may erupt again.
Volcano: A vent in the surface of the Earth through which magma and associated gases and ash erupt; also, the form or structure (usually conical) that is produced by the ejected material.
volcano.und.nodak.edu /vwdocs/glossary.html   (4560 words)

 Volcanoes Online: Glossary
Complex Volcano: A volcano that consists of a complex of two or more vents, or a volcano that has an associated dome, either in its crater or on its flanks.
Dormant Volcano:A volcano which is presently inactive but which may erupt again.
Plug:Lava solidified in the conduit of an extinct volcano.
library.thinkquest.org /17457/glossary/glossary.html   (1253 words)

 Volcanoes - Wikitravel
A volcano is defined as active if it has erupted within the last 10,000 years (less than a second in geological time!), according to the Smithsonian Global Volcanism Program, the major volcano monitoring organization based in Washington, DC.
Mauna Kea is the highest volcano in Hawaii at 4205 metres (13,796 ft), and is pockmarked with cinder cones.
Hale'akala ("House of the sun" in Hawai'ian), is the tallest volcano on the island of Maui, and is renowned for its erosional crater and the cinder cones nestled inside.
wikitravel.org /en/Volcanoes   (1863 words)

 Active, Dormant and Extinct Volcanoes   (Site not responding. Last check: 2007-11-05)
An active volcano is one that has erupted recently or on volcanologists might erupt soon.
Active volcanoes are watched very closely so people and animals in the area can be moved to a save place.
A dormant volcano or sleeping volcano is a volcano that has been quiet for a long time, but still has signs it may erupt again.
members.aol.com /ckckside/reports/volcanoes/vol4.htm   (305 words)

 Netfundu.com - Volcano   (Site not responding. Last check: 2007-11-05)
The largest volcano in the solar system, Olympus Mons, towers 24 kms high and is found on Mars.
Dormant Volcano: If a volcano has erupted during the last few thousand years, but not the last few hundred years, then it is a dormant volcano.
The ring includes the Andes of South America, the volcanoes of Central America, the Cascades and Aleutians of North America, the volcanoes of the Kamchatka Peninsula and Kuriles in Eastern Russia, Japan, the Izu and Mariana Islands, the Philippines, Indonesia, Papua New Guinea, Tonga, Kermadek, and New Zealand.
www.netfundu.com /geography/land/volcano.htm   (1241 words)

 Plotting Different Volcanoes in the West Coast
An "active volcano" is defined as a volcano in an eruptive stage or shows signs of eruption.
A dormant volcano is a volcano that has been active in the past, but is presently "sleeping." Dormant volcanoes can erupt again.
Dormant volcanoes often have small earthquakes, suggesting magma is moving underneath them.
www.msnucleus.org /membership/html/k-6/pt/hazards/1/pth1_2a.html   (411 words)

 Re: When does a dormant volcano become an extinct volcano?
I would argue that the term "dormant" is meaningless as a geological term: a volcano is either extinct or it is active.
Such volcanoes would be classed as dormant, which is merely to say active, but with a periodicity of eruption that is long by human standards.
Such "dormant" volcanoes may be extinct, but it is difficult to state categorically that they are.
www.madsci.org /posts/archives/jan2001/978558990.Es.r.html   (1193 words)

 Volcano | World of Earth Science
Volcanoes are vents or fissures in Earth's crust through which lava, gases, and pyroclastic debris are released.
Based on the timing of their last eruption, volcanoes are classified as active (having erupted during historic time), dormant (having no recent eruptions, but with the potential to erupt again), or extinct (having no historic eruptions and showing no evidence of future eruptions).
Shield volcanoes, with their gentle slopes and curved profile, are the largest of all volcanoes.
www.bookrags.com /research/volcano-woes-02   (874 words)

 Internet Geography - GeoTopics - Volcanoes
A volcano is a conical hill or mountain formed by material from the mantle being forced through an opening or vent in the Earth's crust.
Volcanoes are found along destructive (subducting) (diagram) plate boundaries, constructive (divergent) (diagram) plate boundaries and at hot spots in the earth's surface.
On 9 June 1991, Mount Pinatubo, a volcano in the Zambales Range, 80km (50 miles) north of Manila, capital of the Philippines, hit the headlines.
www.geography.learnontheinternet.co.uk /topics/whatvolcano.html   (575 words)

 Volcano Pics
Licancabur Volcano, a strato volcano in the Atacama desert, in Chile
Pico de Teide is a dormant volcano on the Spanish Island of Tenerife, in the Canary Islands
A cinder cone in the crater of Mauna Loa
members.tripod.com /midju/1.htm   (435 words)

 Views of the National Parks   (Site not responding. Last check: 2007-11-05)
Volcanoes are built from layers of lava and tephra (particles of rock, solidified lava, and ash of all different sizes).
Volcanoes are openings, or vents, in the surface of Earth where gases, lava and pyroclastic material are erupted.
The volcano's height is reduced as it is eroded from the top, and the weight of the layers and layers of lava causes the volcano to subside (sink).
www2.nature.nps.gov /views/KCs/Volcanism/HTML/ET_01_Intro.htm   (3696 words)

 Active Hawaiian Volcanoes Summary
Extinct volcanoes where the last eruption was very long ago, and many times longer than the typical reccurence interval for different types of volcanic systems, can be safely regarded as extinct.
The terms "dormant" and "extinct" as commonly applied to Quaternary volcanoes are more imprecise because What determines this distinction is not a set period of time since last volcanic event.
Instead it is a coin toss between calling a volcano dormant or extinct, so we try to provide as much additional information as possible with this assigned status so that other people can evaluate how certain we are of this assessment.
www.soest.hawaii.edu /GG/HCV/haw_activity.html   (440 words)

 Volcano Worksheets
A volcano that is not currently erupting, but may erupt in the future.
The opening on the top of a volcano through which lava and gases are released.
Mauna Loa, on the island of Hawaii, is this type of volcano and takes up nearly half of the total area of the island.
www.edhelper.com /volcanoes4028.htm   (758 words)

 Talk:Volcanoes - Wikitravel
In fact, the mountainous character of a volcano is often underestimated: for example, most of the (few) accidents on the popular (active) volcanoes Stromboli and Etna in Italy have resulted from sudden changes of weather, such as lightning strikes and misorientation.
Active volcanoes should be approached with care and some extra preparations should be taken, which depend basically on the level of activity and the kind of activity, as well as on where you want to go to observe this activity.
Visiting Popocatepetl in Mexico, a typically explosive volcano, would be life-threatening, if you were to climb up to its rim (forbidden at the moment, by the way), because it might very well covery you with large stones...
wikitravel.org /en/Talk:Volcanoes   (1146 words)

 Honolulu Star-Bulletin Business
The Koolau and Waianae volcanoes, the two primary volcanoes that built the island, erupted from 2 to 5 million years ago.
Volcanoes erupt when they are ready, regardless of what names we use to classify their behavior.
It may seem strange to think that no one knew it was a volcano, but the geysers of Yellowstone illustrate that there are not necessarily volcanoes in the vicinity of hot springs.
starbulletin.com /2002/10/20/business/brill.html   (756 words)

 Introduction to Insight Meditation: Volcano
I think that the great Indian Sage, if there were volcanoes where he lived, would have used them in his teachings, as he did with the lofty, snow-capped Himalayas.
Living volcanoes which are active – as can be seen by their still fuming craters – can blow up at any time, although modern science has instruments that can forewarn us to some degree.
Sleeping volcanoes are dormant because they have not shown any activity for some time.
www.buddhanet.net /volcano1.htm   (843 words)

 Mauna Kea Volcano, Hawai`i
Tall cinder cones atop the summit of Mauna Kea (4,205m) and lava flows that underlie its steep upper flanks have built the volcano a scant 35 m higher than nearby Mauna Loa (4,170 m).
Both volcanoes are so high that snow falls during winter months, perhaps accumulating to a few meters depth.
Mauna Kea is presently a dormant volcano, having last erupted about 4,500 years ago.
hvo.wr.usgs.gov /volcanoes/maunakea   (444 words)

 Volcano Climbing in Guatemala
Our special volcano climbing routes are chosen carefully to bring you an unforgettable adventure.
On 2 day trip camp between the volcanoes and enjoy the sunrise on top of Fuego volcano.
All of our volcano climbing journeys are designed for all ages and abilities.
www.guatemalaventures.com /volcano_climbing.htm   (313 words)

 Dormant Bass Tabs
A dormant volcano is one which is not currently erupting, but is believed to still be capable of erupting.
In practice, it is often not possible to distinguish between a dormant and an extinct volcano.
Volcanoes may remain dormant for thousands of years between eruptions, and several volcanoes thought to be extinct have subsequently re-erupted.
www.bassmasta.net /d/dormant   (180 words)

 MCOATT - Daily Lesson Plan
An active, or live, volcano is one that is erupting or has shown signs that it may erupt in the near future.
Shield volcanoes are formed when repeated lava flows during quiet eruptions gradually build up a broad, gently sloping volcanic mountain known as a shield volcano.
Lastly, composite volcanoes are formed when layers of lava alternate with layers of ash, cinders and bombs (which has both quiet and explosive eruptions).
www.msu.edu /~carpen87/portfolio/lesson_powerpoint_2.html   (817 words)

 NOVA | Volcano's Deadly Warning | TV Program Description | PBS
In January 1993, six scientists and three hikers were scalded and crushed to death when they ventured into the smoking mouth of the active volcano Galeras in Colombia, confident that no eruption was imminent.
Tremors and smoke have long been omens that a dormant volcano was coming back to life, but no one could say with certainty when or if it would explode.
For decades no one knew what the signals meant, but Chouet realized they were signs that magma and gas were surging into a volcano like air being pumped into a tire.
www.pbs.org /wgbh/nova/volcano/about.html   (364 words)

 Patti Orban
Tephra:     Magma is that ejected from the volcano as dust, ash, cinders, pumice
It is magma that hardened after being sprayed from the volcano.
A dormant volcano is one that has not erupted in a while.
www.cst.cmich.edu /users/kiefe1we/orban1ps/pub_html/-Volcanoes.htm   (1190 words)

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