Question

its important to note that the earths structure is not static but is always changing. for example, the lithospheres tectonic plates are always moving which causes earthquakes, mountain building, and volcanoes. which layer retains heat from the earths formation and is molten? asthenosphere outer core lower mantle

Explanation:

The asthenosphere is a semi - molten layer in the upper mantle. It retains heat from the Earth's formation. The outer core is liquid but its heat source is more from radioactive decay. The lower mantle is solid.

Answer:

asthenosphere