Understanding the Water Cycle

What percentage of the Earth's surface is covered by water?

• 90%

• 50%

• 71%

• 85%

What happens to water molecules when they are warmed by sunlight?

• They disappear

• They vibrate more quickly

• They slow down

• They freeze

What forms when water vapor condenses onto tiny dust particles?

• Snow

• Rain

• Clouds

• Fog

In which seasons can water fall as snow onto mountains?

• Winter and Spring

• Spring and Summer

• Summer and Autumn

• Autumn and Winter

Where does water eventually flow back to after traveling through rivers and streams?

• Mountains

• The ocean

• Underground aquifers

• Lakes