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Answer 1

Answer:

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Your answer is:-

Explanation:

1..

The atmosphere is the most dense near the surface because of gravity. As one goes higher, the air gets thinner and thinner.

2...

IONOSPHERE layer of atmosphere helps in radio transmission. It influences radio propagation to distant places on the Earth. The region of the earth's atmosphere between the stratosphere and the exosphere. Ionosphere layer of atmosphere helps in radio transmission

3...

The troposphere provides oxygen that we can breathe, keeps Earth at a livable temperature, and allows for weather to occur, making it a very important part of the atmosphere.

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Answer 2

A.ATMOSPHERE IS VERY DENSE NEAR EARTH SURFACE AS IT ACTS A BARRIER WHICH HELPS IN DEFENDING EARTH FROM UV RAYS,IR RAYS WHICH CAN BE HARFMUL TO US

B.IONOSPHERE WHICH IS A PART OF ATMOSPHERE HELPS IN RADIO COMMUNICATION AS IT CONTAINS CHARGED PARTICLES AND PLASMA WHICH HELPS IN RADIO WAVE PROPAGATION TO DISTANT PLACES ON EARTH.

C.TROPOSPHERE CONTAINS MANY GASES BUT IT ALSO CONSISTS OF A LIFE SUPPORTING GAS FOR US WHICH IS OXYGEN AND EVEN PLANES FLY OVER THERE