Draw & explain the process of mantle convection and how it results in the movement of the Earth's tectonic plates. Be sure to include concepts such as thermal energy & density.

one would be wind another would be water density

igneous rocks which formed by the crystallization of magma at the surface of the earth called extrusive rocks. they are characterized by fine-grained textures because the rapid cooling at or near the surface did not provide enough time for large crystals to grow.

geologic time scale (for gradpoint) =)