The video explores the Earth's internal structure, focusing on its three main layers: the crust, mantle, and core. It compares these layers to a baseball's structure and provides a detailed examination of the crust, highlighting its composition, thickness, and visibility in certain areas like Death Valley. The crust is primarily made of silicates and varies in thickness from land to ocean.

What analogy is used to describe the layers of the Earth?

How does the thickness of the crust vary between land and oceans?