Scientists believe convection currents are the force behind the plate tectonics theory.
Occurs when new oceanic crust forms at mid ocean ridge and old crust moves away from the ridge. Magma, Lava. Molten rock or _____ rises from the mantle through cracks in the crust. It erupts as ____ from volcanic vents along the mid ocean ridge.
The answer is: [A]: troposphere .
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