Question

Explain atmosphere..​

Answer 1

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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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