Front

What is precipitation?

Back

Precipitation is moisture that falls to the ground in the form of rain, sleet, snow, or hail.

Front

What role does the sun's energy play in the water cycle?

Back

The sun's energy causes evaporation, which is the process of water turning into vapor.

Front

How has the amount of water on Earth changed over the last million years?

Back

The total amount of water on Earth has remained the same.

Front

What is a true statement about Earth's water?

Back

The total amount of water on Earth stays the same.

Front

What is evaporation?

Back

Evaporation is the process by which water changes from a liquid to a gas due to heat from the sun.

Front

What is condensation?

Back

Condensation is the process where water vapor cools and changes back into liquid water, forming clouds.

Front

What is the water cycle?

Back

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

Front

What is runoff?

Back

Runoff is water that flows over the ground surface and returns to rivers, lakes, and oceans.

Front

What is percolation?

Back

Percolation is the process by which water moves downward through soil and rock layers.

Front

What is the difference between evaporation and condensation?

Back

Evaporation is the process of water turning into vapor, while condensation is the process of vapor turning back into liquid.