what is the second layer of earth called
The second layer of the earth is just below the crust. Itâs called the mantle. The mantle is very thick: 1800 miles deep. The mantle is a little bit like a sandwich. On the top and bottom parts of the mantle, the rock doesnât move very much. In the middle of the mantle is the asthenosphere. This part of the mantle moves around fairly slowly.