A volcano is a mountain or hill formed by the accumulation of magma or molten rock. Magma is typically produced at depths of 50 to 60 miles below the surface; because liquid magma is less dense than solid rock, it is pushed out of cracks in the Earth's surface. Volcanic eruptions can be deadly, damaging property and infrastructure.
Dynamics
Details how volcanoes develop and erupt. |
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Types
Discusses the different types of volcanoes. |
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Past Eruptions
Descriptions and pictures of past eruptions. |
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Effects
Examines the local and global effects of volcanic eruptions. |
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