Question

Explain atmosphere....

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Answer 1

Answer:

The atmosphere is the blanket of gases which surrounds Earth. It is held near the surface of the planet by Earth's gravitational attraction. Without the atmosphere there could be no life on Earth. The atmosphere: ... keeps the climate on Earth moderate compared to that of other planets

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Answer 2

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✒ Atmosphere :-

• An atmosphere is a blanket of gases that surrounds Earth.
• It is held near the surface of the planet by Earth’s gravitational attraction.
• Argon, oxygen and nitrogen from the three main constitutions of the atmosphere.
• There is no boundary between the atmosphere and outer space.
• The atmosphere gets less dense and denser until it “blends” into outer space.

✒ Facts about Atmosphere :-

• The Atmosphere contains the air that we breathe.
• The Atmosphere helps retain the sun’s heat and prevents it from escaping back into space.
• The Atmosphere protects life from harmful radiation from the sun.
• The Atmosphere plays a major role in Earth’s water cycle.
• The Atmosphere helps keep the climate on Earth moderate.

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✏ Layers of Atmosphere :-

There are Five Layers of Atmosphere named as

1. Exosphere
2. Thermosphere
3. Mesosphere
4. Stratosphere
5. Troposphere

Let study about different types of layers in Atmosphere in Detail.

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1. Exosphere

• Exosphere is the final frontier of the Earth’s gaseous envelope.
• The air in the exosphere is constantly but gradually leaking out of the Earth’s atmosphere into outer space.
• There is no clear cut upper boundary where the exosphere finally fades away into space.

2. Thermosphere

• The thermosphere is the layer in the Earth's atmosphere directly above the mesosphere and below the exosphere.
• Within this layer of the atmosphere, ultraviolet radiation causes photoionization/photodissociation of molecules, creating ions.
• The thermosphere thus constitutes the larger part of the ionosphere.

3. Mesosphere

• Above the stratosphere is the mesosphere and it extends to a height of about 85 km (53 miles) from the ground.
• Here, the temperature grows colder as you rise up through the mesosphere.
• The coldest parts of our atmosphere are located in this layer and can reach –90°C.

4. Stratospher

• Above the troposphere lies the stratosphere which extends from the top of the troposphere to about 50 km (31 miles) above the ground.
• The ozone layer lies within the stratosphere.
• Ozone molecules in this layer absorb high-energy ultraviolet (UV) light from the Sun and convert it into heat.

5. Troposphere

• The troposphere is the lowest layer in the atmosphere.
• It extends upward to about 10kms above sea level starting from ground level.
• The lowest part of the troposphere is called the boundary layer and the topmost layer is called the tropopause.
• The troposphere contains 75% of all air in the atmosphere.

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