The bis the crust, which covers the earth.

The asthenosphere acts as the lubricating layer below the lithosphere that allows the lithosphere to move over the Earth's surface. The mantle is the layer of the earth that lies below the crust and is by far the largest layer making up 84% of Earth's volume.

Historians are researchers of the past or people who understand the history of people. with this field, they must possess qualities such as being unbiased, patient, efficient reader, has a knack for logic and critical thinking and reasoning, disciplined, open-minded, resourceful, with good analytical ability, good reasoning skills and problem solving!