What plates are involved in a destructive plate boundary?
an oceanic plate slide underneath a continental plate
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The area in which crust is destroyed in a destructive margin
subduction zone
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What happens at conservative plate margins?
plates slide past each other
crust is not created or destroyed
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What happens at constructive plate margins?
plates move away from each other
magma rises up to fill the gap creating new crust
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Name 3 features of oceanic plates
high-density materials
made of basaltic rock
only 7-10km thick
they sink under other plates
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Name 3 features of continental plates
45-75km thick (more so than oceanic)
less dense than oceanic plates
made of granitic rock
they do not sink
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Which type of boundaries / margins are volcanoes found at?
constructive plate margins
along the ocean ridge
destructive subduction boundaries
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why are there no volcanoes found at destructive collision boundaries or conservative margins?
because there is no subduction
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What is an island arc?
they form at destructive subduction boundaries when the descending plate melts causing magma to rise. This forms volcanic islands to form in a line.
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what is a young fold mountain?
they are created at destructive subduction and collision boundaries. As the plates move together, ocean sediment between them is pushed up into folds between them.
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Other cards in this set
Card 2
Front
The area in which crust is destroyed in a destructive margin
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