PDF chapter test TRY NOW
1. State Kepler’s laws.
The three Kepler's laws of planetary motion are given below.
First law or the :
All planets revolve around the Sun in , with Sun at one of their .
Second law or the :
The line connecting the planet and the Sun covers in .
Third law or the :
The of the of a planet around the Sun is to the between the sun and the planets.
2. What factors have made life on Earth possible?
Earth is the only planet where is known to exist. Some are mainly responsible for the existence of life on Earth. They are
i. ,
ii. ,
iii. , and
iv. .
Register for free to see more content