ANSWER:
The "mantle" is made up of two structural zones: the lithosphere and the asthenosphere.
Step-by-step explanation:
- The Mantle is the layer of rock that lies in between "Earth's Crust and Core". The thickness of mantle is about "2,900 KM".
- The outer part of the earth which is solid is called lithosphere. The structural zone of mantle that is responsible for the movement of tectonic plates is lithosphere.
- Asthenosphere is the upper mantle layer which lies just "below the lithosphere".