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Key Words

wind breeze gale storm gases evaporate condense

pollution dust fossil fuels smoke pesticides windmills rivers
lakes ponds surface water streams dirt germs filter steam
evaporation condensation clouds water cycle

Let’s Exercise
Let ’ s Ex er cise

I. Fill in the blanks.

1. All living things need to breathe.

2. Moving air is called .

3. A gentle moving air is called a .

4. The strong wind that brings rain is called a .

5. A strong moving breeze that blows fast is called a .

6. When water is heated, it produces .

II. Identify the wrong statement and rewrite it correctly.

1. One-fourth of the Earth’s surface is covered with water.

2. Water in lakes, ponds and rivers is called underground water.

3. Water from lakes and rivers is sent to water treatment plants to remove
dirt.

4. When water is heated, it produces steam.

5. The process by which water changes into water vapour is called evaporation.

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