Page 225 - New Medley 4 Semester 2 PDF (Merged)

C. Match the following.

Column A Column B

1. Ice crystals (a) fog
2. Small round balls of ice (b) dew

3. Droplets of water on leaves (c) frost
4. Cloud touching the earth (d) hailstones

5. Frozen dew drops (e) snowflakes

D. Answer these questions.

1. How are clouds formed?

2. What factors affect the rate of evaporation?
3. How are rain, snow and hail formed?

4. What is water pollution? How can polluted water be purified for drinking?

5. Draw water cycle.

Think and Answer • Critical Thinking

1. Early morning flights are delayed during winter. Why?
2. Why does the water table rise during the rainy season?

3. Clothes do not dry easily during the rainy season. Why?

Let Us Do

1. Our modern lifestyle is the main cause of • Communication/Health and Well-being
water pollution. Discuss in the class.

2. Make a water cleaner. • Creativity

l Mix some soil in 1 litre of water.
l Pour the dirty water into a large bowl.

l Put a glass tumber in the centre of the bowl.
l Put the bowl in a polythene bag and seal it
tightly.

l Put a small piece of stone on the polythene bag right over the glass tumbler.

l Leave the water cleaner in the sun throughout the day.
l In the evening, remove the polythene bag carefully. What do you see?

You will get clear water in glass tumbler.

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