History of Volcano

	Revision 7 . . (edit) November 19, 2001 11:48 am by EvelynToseland
	Revision 6 . . (edit) November 15, 2001 1:55 pm by (logged).233.33.xxx
	Revision 5 . . October 25, 2001 11:51 pm by Vicki Rosenzweig [better explanation of where volcanoes occur; some minor tidying]
	Revision 4 . . October 10, 2001 1:18 am by Alan Millar [picture]

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Difference (from prior major revision) (minor diff, author diff)

Changed: 1c1

A volcano is a place where the earth's crust is weak, and seismic activity lead to expulsions of lava?, gases and brimstone? during eruptions?. Volcanoes are usually situated on [seismic zone]?. Volcanoes may be either dormant (having no activity) or active (near constant expulsion and occasional eruptions), and change state unpredictably.

A volcano is a place where the earth's crust is weak, and seismic activity leads to expulsions of lava?, gases and brimstone? during eruptions?. Volcanoes are usually situated either at the boundaries between [tectonic plates]? or over [hot spot]?s. Volcanoes may be either dormant (having no activity) or active (near constant expulsion and occasional eruptions), and change state unpredictably.

Changed: 7c7

Volcanic activity is often accompanied by earthquakes, [hot springs]? and geysers?. Famous volcanoes are [Mount Aetna]?, [Mount Hekla]?, [Mount Fuji]? and many others.

Volcanic activity is often accompanied by earthquakes, [hot springs]? and geysers?. Famous volcanoes include [Mount Aetna]?, [Mount Hekla]?, Vesuvius?, and [Mount Fuji]?.

Changed: 11c11

Public domain picture from NASA

Public domain picture from NASAof Tambora, Indonesia.

Changed: 13c13,14

Anyone know what volcano this is? I'm guessing Mt St Helens...

/Ancient? /Prehistoric?