Question

atmosphere amazing fact

Answer 1

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1.The Earth is wrapped in a layer of gas called atmosphere. Atmosphere is tied to Earth by gravitation, so that it cannot disperse in the space. It is 500 km (300 mi) thick, being made of a mix of about 10 gases, called air. The air is made by nitrogen (78 %), oxygen (21 %) and other gases (argon, carbon dioxide, helium, neon). These are chemically inert. Others can react with different chemicals: sulfur dioxide, ammonia, methane, carbon monoxide, ozone and water vapors. There are also contaminants, like toxic gases, smoke, salt, dust and volcanic ash.

2.Atmosphere is made of 4 layers: troposphere, stratosphere, mesosphere and thermosphere.

Troposphere is the thinnest layer (12 km or 7.5 mi), but comprises 80 % of the weight of the atmosphere, being its densest layer. Planes do not fly over 9-11 km (5.5-7 mi). It is the warmest layer, because the reflected sun rays heat up the air. As we go further up into the atmosphere, the temperature decreases with 6.5oC each km (0.6 mi), reaching -55o C at the upper limit of the troposphere (called tropopause).

3.Stratosphere goes up to 50 km (30 mi) over the Earth. At its upper edge, there is the maximum ozone concentration, called the ozone belt. Here, the temperature is higher than in the troposphere, because the ozone absorbs a great amount of the ultraviolet rays. Pollution causes the destruction of the ozone belt, and, without it, the Earth would be exposed to the deadly UV light. Stratopause makes the connection between stratosphere and mesosphere.

4.Mesosphere lies between 50 to 70 km (30-42 mi) over the Earth. It is the coldest layer of the atmosphere (-90o C). This is the formation zone for ice clouds that are visible only during the sunset, when they are lighted from downwards. Usually, meteorites falling over the Earth are burned into mesosphere. Even if the air is rarer there, the resulting friction caused by meteorites choking with oxygen produces a burning temperature that destroys the meteorites.



Hope this helps you......

Answer 2

The atmosphere surrounds the planet, protecting it by absorbing the ultraviolet radiation from the sun, and regulating the temperature extremes that would otherwise occur between day and night. 
The atmosphere has 4 layers troposphere, stratosphere, mesosphere and thermosphere.