What is the earths outer layer like underneath thr surface

The Earth is made up of many rocky layers deep down into the crust.

The crust is the solid outer layer, and below it lies a layer of extremely hot, almost solid rock called the mantle. The core is the exact center of the earth surface that is beneath the mantle.

Explanation:

doctrine that the us had the right to expand throughout north america.

b.

developed countries have tended to improve the environment, while developing countries have tended to damage it.