Question

D. Give reasons.
1. The atmosphere makes life possible on Earth,
2. Mesosphere has high night-shining (noctilucent) clouds.
3. Temperature decreases with altitude in the troposphere.
4. The air resting over the poles is dense and heavy.
5. Jet planes move in the stratosphere.



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Answer 1

Answer:

1.Earth's amazing gaseous atmosphere is responsible for making life possible on this, the third planet from the Sun. Our atmosphere contains water vapor which helps to moderate our daily temperatures. Our atmosphere contains 21% oxygen, which is necessary for us to breathe, 78% nitrogen, and . 9% argon.

2.Bottom line: You can see noctilucent clouds (aka night-shining clouds or NLCs) during summer at high latitudes. They form in the highest reaches of the atmosphere – the mesosphere – as much as 50 miles (80 km) above the surface.

3.In the troposphere, the temperature generally decreases with altitude. The reason is that the troposphere's gases absorb very little of the incoming solar radiation. Instead, the ground absorbs this radiation and then heats the tropospheric air by conduction and convection.

4.Very simply, air over the poles is dense and heavy because it is cold. ... Further from the pole, around 60 degrees latitude, the surface is warmer (open water in the southern hemisphere, and warmer land or open water in the north), warm enough for air at the surface to rise.

5.Commercial jet aircraft fly in the lower stratosphere to avoid the turbulence which is common in the troposphere below. The stratosphere is very dry; air there contains little water vapor. ... Because of this, jet aircraft and weather balloons reach their maximum operational altitudes within the stratosphere.