Water Cycle

Front

How much of Earth's freshwater is available for use?

Back

1%

Answer explanation

Only about 1% of Earth's freshwater is accessible for human use, as the majority is trapped in glaciers and ice caps or is found in remote locations. This makes the correct answer 1%.

Front

What is the energy source for the water cycle?

Back

the sun

Answer explanation

The energy source for the water cycle is the sun. It heats water in oceans and lakes, causing evaporation, which is essential for the cycle to continue.

Front

What part of the water cycle does this picture show?

Back

precipitation

Answer explanation

The picture shows precipitation, which is the part of the water cycle where water falls from the atmosphere to the ground as rain, snow, or other forms. This distinguishes it from evaporation and condensation.

Front

What part of the water cycle does this picture show?

Back

evaporation

Answer explanation

The picture shows evaporation, which is the process where water changes from liquid to vapor, rising into the atmosphere. This is a key part of the water cycle, distinct from condensation and precipitation.

Front

evaporation

Back

The part of the water cycle when the sun heats up water, turning it from a liquid into water vapor or steam. It rises from the ground into the air.

Answer explanation

Evaporation is when the sun heats up water, converting it from a liquid into water vapor or steam, which then rises into the air. This process is a key part of the water cycle.

Front

Condensation

Back

The part of the water cycle when the water vapor in the air gets cold. The water turns back into a liquid and forms clouds.

Answer explanation

Condensation is the process in the water cycle where water vapor cools and turns back into liquid, forming clouds. This is the correct definition, distinguishing it from evaporation and precipitation.

Front

Precipitation

Back

The part of the water cycle when clouds get heavy and can no longer hold the liquid water. This causes the water to fall from the sky to the earth as rain, snow, sleet, or hail.

Answer explanation

Precipitation occurs when clouds become heavy with water and can no longer hold it, leading to water falling to the earth as rain, snow, sleet, or hail. This is the correct definition of precipitation in the water cycle.

Front

When water condenses, the water vapor in the air gets ___________ and changes back into liquid.

Back

cold

Answer explanation

When water vapor condenses, it loses energy and cools down, resulting in the water vapor becoming cold and changing back into liquid. Therefore, the correct answer is 'cold'.

Front

Which is the opposite of condensation?

Back

evaporation

Answer explanation

The opposite of condensation, which is the process of gas turning into liquid, is evaporation. Evaporation is when liquid turns into gas, making it the correct answer.

Front

Why is runoff important?

Back

It returns water to other locations on Earth

Answer explanation

Runoff is important because it returns water to other locations on Earth, helping to replenish rivers, lakes, and groundwater. This process is essential for maintaining the water cycle and supporting ecosystems.