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- Volcano (27295 bytes)
1: ...o2.jpg|thumb|225px|left|Volcano Illustration provided by [http://classroomclipart.com Classroom Clipar...
2: ...) where [[magma]] (rock of the earth's interior made molten or liquid by high pressure and temperature...
10: ...mple. This type of volcano has a tendency to explode because it easily plugs. [[Mount Pel饝] on the i...
12: ... and ''mafic'' are sometimes substituted by the older chemistry terms "acidic" and "basic", respective...
15: ... huge quantities of lava that gradually build a wide mountain with a shield-like profile. Their lava f... - Geyser (14881 bytes)
4: ...tivity may change or cease due to ongoing mineral deposition within the geyser plumbing, exchange of f...
9: ...nected to one or more narrow tubes that lead to underground reservoirs of water.
14: ...f the column and thus the pressure on the water underneath. With this release of pressure, the superh...
22: ...and eruptions will erode the channels and rapidly destroy any nascent geysers.
24: ...e inside of the plumbing systems. Over time these deposits cement the rock together tightly, strengthe... - Hot spring (7271 bytes)
3: ...e]] (which is usually around 55~57°F or 13~14°C in the eastern [[United States]]).
7: ...the geothermal [[gradient]]. If water percolates deeply enough into the crust, it will be heated as i...
9: ...have been seriously burned and even killed by accidentally or intentionally entering these springs.
11: ... of the United States|U.S. President]] [[Franklin Delano Roosevelt|Franklin D. Roosevelt]], who built ...
15: ... springs have, they are often popular [[tourist]] destinations, and locations for [[rehabilitation]] [...
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