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What is the topic of the passage?

• Water circulation

• Controlling water

• Water conservation

• Use of water

2. What is the consequence of having no plants on land?

• no water

• frequent floods

• dry crops

• valuable

Which is one of the ways that men do to affect the water balance?

• shortening streams

• cutting down trees

• preserving water

• protecting ponds and swamps

What is NOT a natural way of conserving and controlling water?

• ponds

• streams

• swamps

• reservoirs

What do people use reservoirs for?

• growing plants

• building dams

• storing water

• preventing