How do plate tectonics work?
What are tectonic plates?
Tectonic plates are fragments of the lithosphere - the topmost layer of solid Earth. It sits on top of the asthenosphere. Tectonic plates can move and interact with each other.
Answer and Explanation:
Tectonic plates move due to convection currents in the asthenosphere. This involves a circular flow of viscous rock in the asthenosphere (due to density differences) which puts strain on the tectonic plates and causes them to move.
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Learn more about this topic:
from General Studies Earth & Space Science: Help & ReviewChapter 7 / Lesson 5