...created by radioactive decay in the mantle and core which is heated by the core. When the particles in the lower atmosphere heat up, they become less dense and rise.
As they move to the top of the Asthenosphere and lithosphere, it cools down, becomes denser and starts to sink in a ciruclar movement - this causes the plates to move.
- Due to its relatively low density, continental crust does not sink and so is permanent: being denser, oceanic crust can sink. Oceanic crust is being formed and destroyed continuously
- Continental plates like the Eurasian Plate may consist of both continental adn oceanic crust
- Continental crust can extend beyonf the land mass
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