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10 volcanoes - VOLCANOES are windows to the earths interior...

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VOLCANOES are windows to the earth’s interior Mt. St . Helens Volcanoes give us: Samples of melted rock from the mantle and deep crust (magma) Samples of solid rock from mantle and deep crust (xenoliths) Information about heat production in mantle and crust
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Most volcanoes are associated with plate boundaries.
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Magma rises because it is less dense than the surrounding rock Magma stops rising when it reaches a level where its density matches the rock density Volcanoes form when magma rises to the earth’s surface
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