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What is essential for the survival of plants, animals, and humans?

• Food

• Shelter

• Water

• Air

Which of the following is a source of fresh water suitable for drinking?

• Oceans

• Seas

• Rivers

• Saltwater lakes

Why is water from oceans and seas generally not suitable for direct drinking?

• It is too cold

• It is too deep

• It is salty

• It contains too much oxygen

What process makes salty ocean water suitable for drinking and other uses?

• Filtration

• Evaporation

• Desalination

• Condensation