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Chapter 7 & 8 (Ocean (trench- the deepest parts of the ocean.,…
Chapter 7 & 8
Ocean
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seafloor spreading-The fromation of new seafloor crust is caused by magma pushing upward and outward on the earths mantle.
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Mid-ocean ridge- has the youngest rock and is where sea floor spreading occurs to help replenish the rock that was removed from
subduction.
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Theories
Continental drift theory- states that the continents were once together and created a super continent called Pangaea then it drifted apart and came to be what it is now..
Plate tectonics theory- It states that earths plates are moving and there moving cause of convection currents and its also moving the worlds continents
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