Lesson 2 : water on earth surface P1

What is the main reason clouds produce rain?

• Clouds are heavy and fall to the ground

• Water droplet in clouds grow large enough to overcomes air resistance

• Clouds are pushed down by wind

• Air pressure increases causing rain to fall

What process causes water droplet to form in clouds?

• Crystallization

• Condensation

• Transpiration

• Evaporation

Which factor primarily causes water vapor to rise and form clouds?

• Wind pressure

• Gravity

• Solar energy

• Lunar energy

Why do some clouds produce precipitation while others do not?

• Some clouds are too far from the ground

• Water droplets in some clouds evaporate before falling

• Some clouds are made up of air only

• Gravity is weaker for certain clouds

What roles does gravity play in precipitation?

• It pushes clouds upwards

• It causes water droplets to fall to the ground

• It prevents water from evaporation

• It changes water vapor to liquid

How do global warming affect precipitation pattern?

• It increases the rate of evaporation leading to more intense precipitation

• It decreases the amount of moisture in the atmosphere

• It reduces the formation of clouds

• It prevents clouds from releasing water.

How do the sun contribute to the water cycle?

• It reduces the amount of water in the atmosphere

• It causes water to evaporate from earth surface

• It pulls water droplets down to earth

• It increases air pressure creating clouds.

How does water vapor in clouds become rain?

• it absorbed energy from the ground

• it loses thermal energy and condenses

• it expands due to heat

• it turns into solid ice