bill nye - water cycle

What are the three states of water mentioned?

• Solid, liquid, plasma

• Solid, liquid, gas

• Ice, water, steam

• Evaporation, condensation, precipitation

What is the process called when water vapor cools and turns back into a liquid?

• Evaporation

• Precipitation

• Condensation

• Collection

Why can water evaporate even if it's not boiling?

• All water molecules are always moving fast enough to become vapor.

• The water molecules are moving at different speeds, and some have enough energy to escape as vapor.

• Evaporation only occurs when water is exposed to direct sunlight.

• The air pressure above the water is too low to keep it in liquid form.

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What is required for water vapor to condense and form liquid droplets?

• A warm, humid environment.

• A surface for the water vapor to stick to.

• High air pressure to force the molecules together.

• Constant movement of all water molecules.

What causes water droplets in clouds to grow large enough to fall as precipitation?

• They absorb heat from the sun.

• They combine with dust particles.

• They collide and merge with other droplets.

• They are carried by strong updrafts.