Forces Shaping the Earth: the Moving Crust

The video explores the dynamic nature of the Grand Canyon over geologic time, emphasizing that the landscape is constantly changing due to stress on the Earth's crust. It explains how forces like tension, compression, and shearing impact rock formations and topography. The video uses examples like gum and candy to illustrate these concepts, showing how stress can stretch, compress, or twist rocks, ultimately shaping the Earth's surface.

What is the term used to describe the forces that push and pull on the Earth's crust?

• Stress

• Weathering

• Erosion

• Gravity

Which type of stress is characterized by stretching materials?

• Tension

• Folding

• Shearing

• Compression

What happens to rocks under compression?

• They become denser

• They become less dense

• They stretch and thin

• They remain unchanged

What is the process called when rocks are twisted or torn apart?

• Compression

• Shearing

• Folding

• Tension

How does shearing affect rocks in the Earth's crust?

• It compresses them

• It stretches them

• It twists or tears them apart

• It melts them