ROTATION AND REVOLUTION OF THE EARTH

I. Choose the correct answer:

1. The Earth is inclined at an angle of —— degree

23 1/2

2. Rotation result in ———

Day and Night changes

3. In a leap years February has ————- days.

29

II. Answer the following:

1. Why does day and night changes happen?

Ø The earth takes approximately 23 hours and 56 minutes for one rotation on its axis.

Ø This movement is called rotation.

Ø It causes day and night.

2. When it is summer in the northern hemisphere, why it is winter in the southern hemisphere?

§ The seasons are not same everywhere on the earth.

§ If it is summer in the northern hemisphere, it is winter in the southern hemisphere.

§ And if it is summer in the southern hemisphere, winter in the northern hemisphere.

§ Hence there is reversal of the seasons.

3. Why do the poles have six months of day and six months of night?

§ The inclination of the Earth’s axis not only causes seasonal changes but there is something amazing about it.

§ At the poles there are six months continuous daylight and six months of continuous darkness.

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