What is water made up of?

• One hydrogen atom and two oxygen atoms

• Two hydrogen atoms and one oxygen atom

• Three hydrogen atoms

• Two oxygen atoms

What is the chemical symbol for water?

• CO2

• H2O

• O2

• H2CO3

How much water evaporates into the atmosphere worldwide every day?

• 1,350 trillion litres

• 13,650 trillion litres

• 1,100 trillion litres

• 13,650 billion litres

What is one important property of water mentioned in the text?

• It is a gas

• It is a solid

• It is a solvent

• It is a mineral

What percentage of the Earth's water is saline or sea water?

• 3%

• 30.1%

• 69%

• 97%

What is the percentage of fresh water available on Earth?

• 3%

• 30.1%

• 69%

• 97%

What is the first stage of the water cycle?

• Condensation

• Precipitation

• Evaporation

• Collection

What happens during the condensation stage of the water cycle?

• Water falls back to Earth as rain or snow

• Water is absorbed by plants and animals

• Water vapour rises and forms clouds

• Water flows back into the oceans

How does precipitation occur in the water cycle?

• By water vapour condensing and falling back to Earth or the oceans

• By water evaporating from the oceans

• By water being absorbed by the ground

• By water vapour rising and forming clouds

What is the role of the sun in the water cycle?

• It causes precipitation

• It helps water flow back into the oceans

• It heats the water, causing evaporation

• It forms clouds in the sky