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Unformatted text preview: results in mountain building through igneous activity and at the boundaries between plates and actual scraping off of material from the subducted plate. Subduction results in plates being forced downward and is seen is formations such as ocean trenches. The rock material of continental plates can be viewed as going through a rock cycle that can be related to plate tectonics. Magma (molten rock) e.g., released from volcanoes, crystallizes and forms igneous rocks ("fire formed rocks"). Through weathering and transport sediment is formed which by lithification become sedimentary rock. Through exposure to high temperatures and pressure, sedimentary rock (or any rock) can be changed into metamorphic rocks . If this rock is exposed to extreme temperatures it can become molten again and form magma, and if released through volcanic activity be reintroduced as igneous rock....
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- Fall '10