Volcano - Revision history

Conservative: /* Supervolcano */

2017-05-04T09:39:20Z

Supervolcano

Conservative: /* Supervolcano */

2017-05-04T05:09:58Z

Supervolcano

Conservative: /* Tephra */

2017-05-04T04:33:14Z

Tephra

Conservative: /* External links */

2017-05-04T04:32:43Z

External links

DavidB4-bot: clean up & uniformity

2016-07-13T21:28:24Z

clean up & uniformity

JoeyJ at 12:24, September 18, 2014

2014-09-18T12:24:00Z

Ed Poor: some obscure terms

2010-01-02T19:00:52Z

some obscure terms

Ed Poor: they ARE mountains

2010-01-02T18:58:54Z

they ARE mountains

Ed Poor: molten rock

2010-01-02T18:58:02Z

molten rock

DeanS: External Links - Interactive Volcanoes

2008-08-05T21:49:44Z

External Links - Interactive Volcanoes

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 According to the website Internet [[Geography]]:
-{{Cquote|A [[supervolcano]] is any volcano capable of producing a volcanic eruption with an ejecta volume greater than 1,000 km3 (240 cu mi). This is thousands of times larger than normal volcanic eruptions. Supervolcanoes are on a much bigger scale than other volcanoes. Unlike composite volcanoes, with their steep sides, they are difficult to spot. They are typically depresssions in the ground. The calderas are so large they can be seen from space. They have been identified in [[Indonesia]], in [[New Zealand]], in [[South America]] and an extinct one in [[Glen Coe]] in the [[UK]].
+{{Cquote|A [[supervolcano]] is any volcano capable of producing a volcanic eruption with an ejecta volume greater than 1,000 km3 (240 cu mi). This is thousands of times larger than normal volcanic eruptions. Supervolcanoes are on a much bigger scale than other volcanoes. Unlike composite volcanoes, with their steep sides, they are difficult to spot. They are typically depresssions in the ground. The calderas are so large they can be seen from space. They have been identified in [[Indonesia]], in [[New Zealand]], in [[South America]] and an extinct one in Glen Coe in the [[UK]].
 Supervolcanoes can occur when magma in the mantle rises into the crust from a hotspot but is unable to break through the crust, and pressure builds in a large and growing magma pool until the crust is unable to contain the pressure (this is the case for the [[Yellowstone]] [[Caldera]]).<ref>[http://www.geography.learnontheinternet.co.uk/topics/whatisasupervolcano.html What is a supervolcano?]</ref>}}

@@ Line 13: / Line 13: @@
 ''See also:'' [[Supervolcano]]
-According to the website Internet Feolography:
+According to the website Internet [[Geography]]:
-{{Cquote|A [[supervolcano]] is any [[volcano]] capable of producing a volcanic eruption with an ejecta volume greater than 1,000 km3 (240 cu mi). This is thousands of times larger than normal volcanic eruptions. Supervolcanoes are on a much bigger scale than other volcanoes. Unlike composite volcanoes, with their steep sides, they are difficult to spot. They are typically depresssions in the ground. The calderas are so large they can be seen from space. They have been identified in [[Indonesia]], in [[New Zealand]], in [[South America]] and an extinct one in [[Glen Coe]] in the [[UK]].
+{{Cquote|A [[supervolcano]] is any volcano capable of producing a volcanic eruption with an ejecta volume greater than 1,000 km3 (240 cu mi). This is thousands of times larger than normal volcanic eruptions. Supervolcanoes are on a much bigger scale than other volcanoes. Unlike composite volcanoes, with their steep sides, they are difficult to spot. They are typically depresssions in the ground. The calderas are so large they can be seen from space. They have been identified in [[Indonesia]], in [[New Zealand]], in [[South America]] and an extinct one in [[Glen Coe]] in the [[UK]].
 Supervolcanoes can occur when magma in the mantle rises into the crust from a hotspot but is unable to break through the crust, and pressure builds in a large and growing magma pool until the crust is unable to contain the pressure (this is the case for the [[Yellowstone]] [[Caldera]]).<ref>[http://www.geography.learnontheinternet.co.uk/topics/whatisasupervolcano.html What is a supervolcano?]</ref>}}

@@ Line 3: / Line 3: @@
 ==Tephra==
-[[Image:Tephra.jpg|thumb|300px|Tephra erupted by Mount St. Helens on 18 May 1980 ranging in size from ash (left 2 piles) to [[lapilli]] (right 2 piles).]]
+[[Image:Tephra.jpg|thumb|300px|left|Tephra erupted by Mount St. Helens on 18 May 1980 ranging in size from ash (left 2 piles) to [[lapilli]] (right 2 piles).]]
 Tephra is a general term for fragments of volcanic rock and [[lava]] that are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains. Tephra includes large dense blocks and bombs, and small light rock debris such as [[scoria]], [[pumice]], [[reticulite]], and [[volcanic ash]].

← Older revision		Revision as of 04:32, May 4, 2017
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	As tephra falls to the ground with increasing distance from a volcano, the average size of the individual rock particles becomes smaller and thickness of the resulting deposit becomes thinner. Small tephra stays aloft in the eruption cloud for longer periods of time, which allows wind to blow tiny particles farther from an erupting volcano.<ref>http://volcanoes.usgs.gov/Products/Pglossary/tephra.html</ref>		As tephra falls to the ground with increasing distance from a volcano, the average size of the individual rock particles becomes smaller and thickness of the resulting deposit becomes thinner. Small tephra stays aloft in the eruption cloud for longer periods of time, which allows wind to blow tiny particles farther from an erupting volcano.<ref>http://volcanoes.usgs.gov/Products/Pglossary/tephra.html</ref>
		+
		+	== Supervolcano ==
		+	[[File:375px-Long Valley Caldera cross section.svg.png\|thumbnail\|200px\|right\|Cross-section through Long Valley Caldera. The valley is one of the Earth's largest [[caldera]]s.]]
		+
		+	''See also:'' [[Supervolcano]]
		+
		+	According to the website Internet Feolography:
		+	{{Cquote\|A [[supervolcano]] is any [[volcano]] capable of producing a volcanic eruption with an ejecta volume greater than 1,000 km3 (240 cu mi). This is thousands of times larger than normal volcanic eruptions. Supervolcanoes are on a much bigger scale than other volcanoes. Unlike composite volcanoes, with their steep sides, they are difficult to spot. They are typically depresssions in the ground. The calderas are so large they can be seen from space. They have been identified in [[Indonesia]], in [[New Zealand]], in [[South America]] and an extinct one in [[Glen Coe]] in the [[UK]].
		+
		+	Supervolcanoes can occur when magma in the mantle rises into the crust from a hotspot but is unable to break through the crust, and pressure builds in a large and growing magma pool until the crust is unable to contain the pressure (this is the case for the [[Yellowstone]] [[Caldera]]).<ref>[http://www.geography.learnontheinternet.co.uk/topics/whatisasupervolcano.html What is a supervolcano?]</ref>}}

	==External links==		==External links==

@@ Line 1: / Line 1: @@
 [[Image:Volcano.jpg|thumb|300px|Snow-covered Kanaga Volcano in Alaska erupts a small column of [[tephra]], gas, and steam. Kanaga is a stratovolcano. View is toward the west.]]
-A '''volcano''' forms when [[magma|molten rock]], in the form of [[lava]], is able to breach the surface of the [[Earth]]. Many volcanoes take the shape of [[mountains]], although some are so large that they form entire [[Island|islands]], as is the case of [[Mauna Loa]]. Volcanoes come in three main types, stratovolcano (also composite cone), shield volcano, and cinder cone. Stratovolcanoes are renowned for their explosiveness, which is cause by the high viscosity of the magma they contain. They can grow to be very large and have steep slopes, but in some eruptions can blow themselves apart. In contrast, shield volcanoes contain magma of very low viscosity, resulting in less violent eruptions and shallow slopes. Finally, cinder cones form very fast and consist of amalgamated [[igneous]] materials. They have very steep slopes and are susceptible to erosion.
+A '''volcano''' forms when [[magma|molten rock]], in the form of [[lava]], is able to breach the surface of the [[Earth]]. Many volcanoes take the shape of [[mountains]], although some are so large that they form entire [[island]]s, as is the case of [[Mauna Loa]]. Volcanoes come in three main types, stratovolcano (also composite cone), shield volcano, and cinder cone. Stratovolcanoes are renowned for their explosiveness, which is cause by the high viscosity of the magma they contain. They can grow to be very large and have steep slopes, but in some eruptions can blow themselves apart. In contrast, shield volcanoes contain magma of very low viscosity, resulting in less violent eruptions and shallow slopes. Finally, cinder cones form very fast and consist of amalgamated [[igneous]] materials. They have very steep slopes and are susceptible to erosion.
 ==Tephra==
 [[Image:Tephra.jpg|thumb|300px|Tephra erupted by Mount St. Helens on 18 May 1980 ranging in size from ash (left 2 piles) to [[lapilli]] (right 2 piles).]]
-Tephra is a general term for fragments of [[volcano|volcanic]] rock and [[lava]] that are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains. Tephra includes large dense blocks and bombs, and small light rock debris such as [[scoria]], [[pumice]], [[reticulite]], and [[volcanic ash]].
+Tephra is a general term for fragments of volcanic rock and [[lava]] that are blasted into the air by explosions or carried upward by hot gases in eruption columns or lava fountains. Tephra includes large dense blocks and bombs, and small light rock debris such as [[scoria]], [[pumice]], [[reticulite]], and [[volcanic ash]].
 As tephra falls to the ground with increasing distance from a volcano, the average size of the individual rock particles becomes smaller and thickness of the resulting deposit becomes thinner. Small tephra stays aloft in the eruption cloud for longer periods of time, which allows wind to blow tiny particles farther from an erupting volcano.<ref>http://volcanoes.usgs.gov/Products/Pglossary/tephra.html</ref>
-==External Links==
+==External links==
 *[http://www.learner.org/interactives/volcanoes/entry.html Interactive Volcanoes] There are many active volcanoes worldwide. Is there anything we can do to predict how and when they will erupt?

@@ Line 1: / Line 1: @@
 [[Image:Volcano.jpg|thumb|300px|Snow-covered Kanaga Volcano in Alaska erupts a small column of tephra, gas, and steam. Kanaga is a stratovolcano. View is toward the west.]]
-A '''volcano''' forms when [[magma|molten rock]], in the form of [[lava]], is able to breach the surface of the [[Earth]]. Many volcanoes tend to resemble [[mountains]], although some are so large that they form entire [[Island|islands]], as is the case of [[Mauna Loa]]. Volcanoes come in three main types, stratovolcano (also composite cone), shield volcano, and cinder cone. Stratovolcanoes are renowned for their explosiveness, which is cause by the high viscosity of the magma they contain. They can grow to be very large and have steep slopes, but in some eruptions can blow themselves apart. In contrast, shield volcanoes contain magma of very low viscosity, resulting in less violent eruptions and shallow slopes. Finally, cinder cones form very fast and consist of amalgamated igneous materials. They have very steep slopes and are susceptible to erosion.
+A '''volcano''' forms when [[magma|molten rock]], in the form of [[lava]], is able to breach the surface of the [[Earth]]. Many volcanoes take the shape of [[mountains]], although some are so large that they form entire [[Island|islands]], as is the case of [[Mauna Loa]]. Volcanoes come in three main types, stratovolcano (also composite cone), shield volcano, and cinder cone. Stratovolcanoes are renowned for their explosiveness, which is cause by the high viscosity of the magma they contain. They can grow to be very large and have steep slopes, but in some eruptions can blow themselves apart. In contrast, shield volcanoes contain magma of very low viscosity, resulting in less violent eruptions and shallow slopes. Finally, cinder cones form very fast and consist of amalgamated igneous materials. They have very steep slopes and are susceptible to erosion.
 ==External Links==