In places where convection currents rise up towards the crust's surface, tectonic plates move away from each other in a process known as seafloor spreading (Fig. 7.21). Hot magma rises to the crust's surface, cracks develop in the ocean floor, and the magma pushes up and out to form mid-ocean ridges.
29 мар. 2018 г. · The magma becomes attached to crust as the magma cools. The attached crust moves with the magma as the magma is moves by the convection currents ... |
The mantle's convective motions break the lithosphere into plates and move them around the surface of the planet. These plates may move away from, move by, or ... |
Videolar The idea is that convection currents reach the asthenosphere and drive the movement of the rigid lithosphere above. The theory proposed as the semi-molten rock ... |
This process repeats forming convection currents throughout the mantle which are strong enough to drive plate movement of a few centimeters per year. |
The friction between the convection current and the crust causes the tectonic plate to move. The liquid rock then sinks back towards the core as it cools. The ... |
9 апр. 2016 г. · Rising magma pushes against and along tectonic plates, which eventually moves the plates together, apart, or along each other. |
Circular convection currents in the mantle move the plates on top - either diverging (plates. Next page. Global earthquake and volcano distribution ... |
28 сент. 2022 г. · These convection currents cause the tectonic plates to move several centimeters per year relative to each other. |
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