Timescale of Earth's Events

Front

What is erosion?

Back

Erosion is the process that causes rough rocks to become smooth over many years by wearing away materials through wind, water, or ice.

Front

What can cause a landslide?

Back

A landslide can be caused by lots of rain, which makes the ground unstable.

Front

What are the agents of erosion?

Back

The agents of erosion include water, wind, and ice.

Front

What does an earthquake cause?

Back

An earthquake causes cracks in the Earth's surface.

Front

How often does the Earth's surface change?

Back

The Earth's surface changes all the time in different places.

Front

What is a volcano?

Back

A volcano is an opening in the Earth's surface where molten rock, ash, and gases can escape.

Front

What is a glacier?

Back

A glacier is a large mass of ice that moves slowly over land.

Front

What is a flood?

Back

A flood is an overflow of water that submerges land that is usually dry.

Front

What is a hurricane?

Back

A hurricane is a powerful storm with strong winds and heavy rain.

Front

What is a tornado?

Back

A tornado is a rapidly rotating column of air that extends from a thunderstorm to the ground.