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| Molten rock that has formed deep within Earth. |
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| At a mid-ocean ridge where the lithosphere is thinner and exerts less pressure. |
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| Where an increase in temperature causes materials in the asthenosphere to melt. |
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| Where an increase in the amount of water in the asthenosphere lowers the melting temperatures of materials there. |
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| Where plates are moving apart. |
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| Where plates are being forced under other plates; where lithospheric plates collide. |
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| Extends along the Pacific coast from northern California to British Columbia, Canada, and is made up of volcanoes that have formed at an oceanic-continental subduction boundary. |
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| A chain of volcanic islands created when two oceanic plates collide. |
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| An example of a volcanic island arc formed at a oceanic-oceanic subduction boundary. |
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| A young, very active underwater volcano about 30 kilometers off the coast of the island of Hawaii. |
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