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4. Day and night are caused by:

(a) earth’s rotation on its axis (b) the tilt of earth’s axis
(c) earth’s revolution around the sun (d) all of these
5. On which date the lengths of days and nights are equal?

(a) 21st March (b) 23rd September (c) 21st June (d) both (a) and (b)
B. Fill in the blanks :

1. The earth travels around the sun in _____________________ orbit.
2. _____________________ was the first to say that the earth is moving on its axis.
3. _____________________ means equal days and equal nights.

4. The movement of the earth around the sun in a fixed path or orbit is called ___________________.
5. The earth takes _____________________ hours to complete one rotation.

C. Write ‘T’ for true and ‘F’ for false :
1. There are six months of day and six months of night at the equator.
2. There are six main types of seasons.

3. Christmas is celebrated in summer in Australia.
4. We feel winter season in Southern Hemisphere on 22nd December.
5. The earth takes 365 hours to complete one rotation.

D. Match the following :
Column 'A' Column 'B'

1. Leap year (a) 21st June
2. Rotation of the Earth (b) 22nd December

3. Summer Solstice (c) 24 hours
4. Winter Solstice (d) 23rd September
5. Autumn season (e) 366 days
E. Answer these Questions :

1. What is rotation? Give an activity to show that rotation is the cause of day and night.
2. What is a leap year?

3. What is revolution?
4. Name any four main seasons?
5. What is an equinox?
6. What is Winter Solstice?

7. What is Summer Solstice?
8. Why are the sun rays never vertical on the Arctic Circle?

Life Skills and Value (Activity)

• Make a poster showing the rotation of the earth.

• Make a project on the causes of seasons. Also write the difference in seasons between Northern
Hemisphere and Southern Hemisphere.
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