DEAR SIR/MADAM PLS ANS....
ALL EXERCISE OUESTIONS

Dear Student,
You are requested to post only 1 question per thread. This will ensure faster and better resolution of your doubts. Kindly repost the other queries separately. 
Here are the answers to the D bit
1. Rotation is the movement of the earth on it's axis. The movement of earth around the sun in a fixed path is called revolution.
2. The earth takes 365¼ days to complete one round of the sun. However, we take 365 days of a year and ignore 6 hours. To fit these 6 hours, after every four years one day is added to the month of February, this is known as a leap year.  
3. 
Rotation Revolution
It is the spinning of the earth on its axis. It is the spinning of the earth around the sun in an orbit.
The earth takes 24 hours for one rotation. Whereas revolution around the sun takes 365 days.
This 24 hour rotation brings about day and night. Revolution brings various seasons.

Regards 

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