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| the outer part of the mantle and th crust; 50-100km thick; no clear edge |
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| a zone of the earth;s mantle that lies beneath the lithosphere and consists of around one-hundred km of deformable rock; softer than the lithosphere; no defined edges |
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| the transfer of heat by the mass movement of heated particles into an area of cooler fluid |
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| a long narrow elevation on the ocean floor |
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| a long, steep-sided, narrow depression in the ocean floor |
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| a volcanic island caused by oceanic-oceanic subduction |
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| a converging plate boundary where oe plate subducts beneath another, usually because it's denser; a trench is formed there; caused when an oceanic and a continental plate collide |
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| a fault that occurs where the edges of two plates slide past eachother (San Andreas Fault) |
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