Class 5th- SSt notes-L3

 CLASS 5TH – SOCIAL STUDIES

3. Movements of the Earth

C. Answer the following questions.

1. How many different types of motions does the Earth have?

Ans. The Earth has two types of motion—rotation and revolution.

2. What is meant by 'rotation' of the Earth? What is the effect of rotation?

Ans. The spinning motion of the Earth around its  own axis is called rotation. The rotation of the Earth around its axis causes day and night. The portion of the Earth facing the Sun has day. The portion facing away from the Sun has night. As the Earth rotates, day and night follow each other.

3. Why is one day and one night on the Earth of 24 hours?

Ans.  The Earth completes one rotation around its axis in 24 hours. That is why one day and one night are of 24 hours.

4. In the month of June it is summer in the Northern Hemisphere and winter in the Southern Hemisphere. Why?

Ans. While revolving around the Sun, the Earth is tilted to one side. The half of the Earth that is tilted towards the Sun gets longer hours of sunlight and has summer. The half that is tilted away from the Sun has lesser hours of sunlight and has winter. In the month of June, the North Pole is tilted towards the Sun, and the South Pole is tilted away from the Sun. So in June, the Northern Hemisphere has summer and the Southern Hemisphere has winter.

5. Why do the seasons repeat year after year?

Ans. . Seasons are caused by two factors—the revolution of the Earth and the tilted axis of the Earth. Both these factors are fixed. The Earth revolves around the Sun in a fixed path called orbit and a fixed time of one year or 365 days. The angle of its inclined axis also never changes. Therefore, the Earth experiences the same seasons year after year.

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