Second kind of Earth’s layering ?

Rocks near surface are cool, strong, and brittle. This layer = lithosphere (= tectonic plate), includes crust and upper part of mantle (~100 km deep). With > depth (~100 - 300 km), it becomes hotter and rocks become weaker and deform plastically. This rock layer = asthenosphere, located entirely in mantle. Rock in asthenosphere is close to its melting temperature, consists of ~1% melt, 99% solid. (based on mechanical properties - rock strength) Rocks near surface are cool, strong, and brittle. This layer = lithosphere (= tectonic plate), includes crust and upper part of mantle (~100 km deep). With > depth (~100 - 300 km), it becomes hotter and rocks become weaker and deform plastically. This rock layer = asthenosphere, located entirely in mantle. Rock in asthenosphere is close to its melting temperature, consists of ~1% melt, 99% solid.