destructive and collision (two continental plates collide together) plate boundaries
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describe the location of ocean trenches (2 marks)
destructive plate boundaries (e.g. S.America and Nazca) often next to fold mountains
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how are fold mountains formed?
Rivers carry sediment into a depression (geosyncline). Deposits in thick layers - millions of years = sedimentary rock. Pates move together and rock is forced upwards = synclines and antisynclines.
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how are ocean trenches formed?
the point where an oceanic plate is sub-ducted underneath a continental plate at a destructive plate boundary
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