Main Points on Troposphere,Stratosphere,and Mesosphere. Class:-7th ncert
Answers
Explanation:
1. Troposphere
- The troposphere is the layer that we live in. The troposphere starts at ground level and extends about 12 km upwards.
- This is where all weather occurs and it’s the air that we breathe.
- A significant amount of the troposphere is just 2 gases. For example, 78% is nitrogen and 21% is oxygen. For the remaining 1%, it’s mostly argon and carbon dioxide.
Whether it’s from agriculture, vehicles, electricity or natural disasters, these major sources of air pollution emit from the ground into primarily the troposphere and stratosphere.
2. Stratosphere
- From about 12 km to 50 km upwards is the stratosphere. In this layer, the jet stream blows strong winds eastward.
- Airplanes use this layer of the atmosphere when they travel from west to east. It gives an extra push on its tail which helps it move faster.
It also has the ozone layer, which absorbs harmful radiation from the sun. This includes UV rays. But in the south pole, there is a hole and if it enlarges could cause issues.
3. Mesosphere
- The mesosphere is the coldest region of Earth’s atmosphere. It’s somewhere close to -100 degrees Celsius.
- In the mesosphere, scientists send unmanned balloons to measure the temperature.
Actually, this layer also protects the Earth from large meteoroids. The friction within this layer causes meteors to burn up.
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Answer:
troposphere is the lowest layer of earth atmosphere between the surface of the earth and about 6 to 10 km above the surface
stratosphere is the layer of the earth atmosphere between about 10 to 50 km above the surface of the earth
mesosphere the region of earth atmosphere between about 50 to 80 km above the surface of the earth