Sci rev

semi-solid, rocky, very hot layer, makes up 80% of the Earth and 

carries most of its mass

 is the solid upper mantle that is so hot it behaves plastically

And can flow.

composed of both the crust and the portion of the upper mantle

that behaves as a brittle, rigid solid. It is the outermost mechanical layer.

 sometimes known as the more rigid and immobile than the

Asthenosphere.

theory that suggests that the planet was once a molten ball, and in the process of cooling, the surface shrunk producing mountain ranges.

 explains how tectonic plates interact with each other. It suggests that when two plates collide one plate is forced beneath the Earth’s mantle, known as ----

 suggested that all of the continents were once a big landmass called Pangaea.