The two gravitational forces which contribute in tectonic plate movement on mid-ocean ridges are ridge push and slab pull.
This lithosphere, which includes the upper mantle as well as the crust of the Earth, is made up of tectonic plates. Oceanic crust, also known as sima from silicon & magnesium, and earth's plates are the two main forms of material that make up the plates, that are approximately 100 km (62 mi) .
Huge fragments of the Earth's upper mantle and crust make up tectonic plates. They are composed of both continental and oceanic crust. Around pre ridges and also the major faults that delineate the boundaries of the plates, earthquakes happen.
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