Question

what is meant by atmosphere​

Answer 1

Answer:

the atmosphere is the layer of gaseous that

surrounded the earth

Answer 2

Atmosphere:-

A blanket of gases surrounding the earth is known as Atmosphere.

Composition:-

Earth's atmosphere is composed of:

•  78% nitrogen
• 21% oxygen
• 1%  other gases.

Based on temperature, the atmosphere is divided into layers:-

Troposphere:

• This is lowest layer of the atmosphere.
• We can see clouds.

Stratosphere:

• This layer contains  ozone which absorbs the Sun's ultraviolet rays, protecting life on the earth's surface.

Mesosphere:

• Reaches about 80km above the surface of the earth.
• This is the coldest layer of the atmosphere as the temperature decreases rapidly with increase of altitude.

Thermosphere:

• It extends to  80-100 kilometres above the earth's surface.
• Presence of very little air.

Exosphere:

• It is the  very outer limit of the atmosphere.
• The bottom of this layer is found at 500 kilometres above the Earth's surface

Importance of atmosphere:-

• Protects life from harmful radiation from the Sun.

• Keeps the climate on Earth moderate compared to that of other planets.
• It serves as a medium for movement of water.

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