Water on Earth

Front

What type of water do oceans contain?

Back

Saltwater.

Front

What type of water do rivers contain?

Back

Freshwater.

Front

What is the greatest threat to groundwater as the population grows?

Back

Sewage.

Front

Why is clean water important?

Back

All life on Earth depends on clean water to live and grow.

Front

Which source of pollution adds the most pollution to the oceans?

Back

Air pollutants.

Front

What is the main component of Earth's water supply?

Back

Oceans, which cover about 71% of the Earth's surface.

Front

What is groundwater?

Back

Water that is found underground in aquifers.

Front

What is the water cycle?

Back

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

Front

What is evaporation?

Back

The process by which water changes from a liquid to a gas.

Front

What is condensation?

Back

The process by which water vapor cools and changes back into liquid water.