The convection currents create the tectonic plate and their movement, while the sinking crust is helping the process of the convection currents.
Explanation:
The convection currents are currents in the mantle layer. They manage to create lot of pressure on the crust above them, thus managed to crack it in numerous tectonic plates. With the convection currents, there is constant creation of new crust on the surface through the magma and lava flows, but also constant destruction of crust.
The newly formed crust pushes the old crust sideways. Gradually, that crust reaches a plate boundary where it subducts. As the crust subducts, its gets into the mantle. The more dense and cooler crust falls deeper into the mantle, and as ti gets heated it starts to move up again, thus the convection currents are formed.
This process has managed to create lot of tectonic plate, such as:
- North American
- Eurasia
- Pacific
- African
- Nazca
- Indo-Australian etc.
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