Topography and the Earth: the Crust

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.

Which layer of the Earth is compared to the covering of a baseball?

• Mantle

• Core

• Crust

• Atmosphere

What is the average thickness of the Earth's crust on land?

• 50 kilometers

• 32 kilometers

• 8 kilometers

• 100 kilometers

What is the primary composition of the Earth's crust?

• Liquids

• Gases

• Silicates

• Metals

Which elements are commonly found in the silicates of the Earth's crust?

• Gold and Silver

• Carbon and Hydrogen

• Nitrogen and Helium

• Aluminum and Iron

How does the thickness of the Earth's crust under the oceans compare to that on land?

• Varies greatly

• Same thickness

• Thinner under the oceans

• Thicker under the oceans