Who was the first Indian astronaut to travel in space?
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Mars is the _______ planet from the Sun.
Helium is added to the oxygen supply of deep sea divers because it is _________
Any undesirable change in physical, chemical or biological characteristics of air, land, water or soil is called?
Which layer of the earth's atmosphere contains the ozone layer?
The centre of a cyclone is a calm area, it is called the ________ of the storm.
Which of the following planets has the highest revolutionary motion?
Which of the following is appropriate to describe a Shooting Star?