What is the process by which clouds are formed?

• Transpiration

• Evaporation

• Condensation

• Precipitation

What do water droplets attach to in order to form clouds?

• Rocks

• Sand

• Grass

• Dust

What happens when large numbers of water droplets join together?

• They evaporate

• They form clouds

• They freeze

• They form rainbows

What happens when water droplets in clouds become too heavy?

• They evaporate

• They form snow

• They fall as rain

• They disappear

What is the main source of energy that affects the water cycle?

• Gravity

• Wind

• Sun

• Magnetism

What causes the leakage of liquid water down into the ground then to groundwater reservoirs?

• Magnetism

• Gravity

• Sunlight

• Wind

What is the process of changing liquid water to water vapor known as?

• Melting

• Evaporation

• Transpiration

• Condensation

Which of the following processes occur when water particles lose thermal energy?

• Melting

• Freezing

• Evaporation

• Transpiration

Where does transpiration take place in plants

• Root

• Stem

• Leave

What percentage of water vapor in the air comes from transpiration of plants?

• 20%

• 15%

• 10%

• 5%