Unit 3: Lesson 1: Distribution of Water

Front

What is the main source of water on Earth?

Back

Saltwater, which makes up about 97% of the Earth's water.

Front

What percentage of Earth's water is freshwater?

Back

About 3%.

Front

Where is most of the Earth's freshwater located?

Back

In ice caps and glaciers.

Front

What is a glacier?

Back

A large mass of ice that moves slowly over land.

Front

What is a reservoir?

Back

An artificial lake built to store water for later use.

Front

What is permafrost?

Back

Ground that remains frozen for two or more years.

Front

How do glaciers and oceans differ in terms of water type?

Back

Glaciers contain freshwater, while oceans contain saltwater.

Front

Why is it difficult for humans to use water from glaciers and oceans?

Back

Glaciers are hard to access, and ocean water is salty and not suitable for drinking.

Front

What is groundwater?

Back

Water that is found underground in soil and rock layers.

Front

What is the water cycle?

Back

The continuous movement of water on, above, and below the surface of the Earth.