Earth

1. what is the semi fluid shell which includes both the crust and uppermost part of the mantle called ?
Ans. Asthenosphere

2. who first measured the size of the earth ?
Ans. Eratosthenes

3. which place has the longest day and the shortest night on 22nd December ?
Ans. Melbourne

4. When is seasonal variation least ?
Ans. In the Arctic Circle

5. The position of the earth in its orbit , when it is at its greatest distance from the sun causing summer in the Northern Hemisphere is
Ans. Aphelion

6. what is the time required for moon light to reach earth ?
Ans. 1.3 seconds

7. what is the specific gravity of the earth as a whole ?
Ans. 5.52

8. what is the term that best describes the shape of the earth?
Ans. Geoid

9. What is the maximum length of a day on the poles ?
Ans. 6 months

10. What percentage of insolation is received by the earth surface ?
Ans. 51%