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Unformatted text preview: form new lithosphere Partial melting of the mantle creates magma, which forms oceanic crust Often marked by giant submarine mountain ranges on the ocean floor (mid-ocean ridges) Occasionally the divergent plate boundary will come above shore • Iceland is formed by the mid-Atlantic ridge o Convergent – moving together One plate slides beneath the other, and is recycled in the deep mantle. This is called a subduction zone Marked by deep trenches, and by chains of volcanoes, as in the Andes In continental collision, two continental plates hit each other; the one with the most density will be subdued and mountains will be formed on the less dense crust. e.g. the Himalayas o Transform – Pass horizontally Plates slide past each other horizontally, without any gain or loss of lithosphere. The boundary is a strike-slip fault e.g. the San Andreas Fault • offset rivers, highways, etc....
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- Spring '08
- Plate Tectonics, San Andreas Fault, divergent plate boundary, mid-Atlantic ridge o Convergent, Total plate area, plates Continents