A unique planet, shape, rotation, revolution, day and night, change of seasons, latitude and longitudes.

1. Name the only planet which has land, air and water? Ans: Earth

2. What is the earth shaped like?
Ans: Geoid (slightly flattened in the extreme north and south)

3. What is the spherical model of the earth called?

Ans: Globe

4. Which imaginary line divides the earth into the Northern Hemisphere and Southern Hemisphere?

Ans: Equator

5. What are the imaginary lines parallel to the equator going east-west direction called?

Ans: Latitude

6. What are the set of lines running from the north pole to south pole called?

Ans: Longitude

7. Which longitude is called the Prime Meridian?

Ans: Greenwich Line

8. How long is Indian Standard Time ahead of Greenwich Time?

Ans: 5 hours and 30 minutes

9. Which longitude is called the International Date Line?

Ans: 180 Degree

10. What are latitudes and longitude together useful for?

Ans: Locating places on the earth

11. In which atmosphere does the Tropic of Cancer lie?

Ans: In the Northern Hemisphere

12. What do we call the movement of the earth around the sun?

Ans: Revolution

13. Which of these causes day and night – rotation or revolution?

Ans: Rotation

14. What is the reason for the day and night not being equal throughout the year?

Ans: Inclination of the earth’s axis

15. Which are the two days in an year when day and night are almost equal?

Ans: Marth 21 and September 23

16. What is the chief reason for the change of seasons?

Ans: Revolution of the Earth

17. Who put forward the theory that the sun is motionless and earth rotated on its axis?

Ans: Copernicus

18. How old is the earth?

Ans: About 3500 million years

19. What is the elliptical path along which the earth moves around the sun called?

Ans: Orbit

20. When it is winter in Europe, what season is it in Australia?

Ans: Summer

21. Which is the longest day in the Northern hemisphere?

Ans: June 21

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