Question

Air surrounds earth as thick a blanket called as.
A. Ozone
B. Layer
C. Atmosphere
D. All of the above

Answer 1

Hint: All living beings on this earth depend on the atmosphere to breathe and it protects us from the harmful effects of the sun’s rays. Without this shield, we would be baked alive by the heat of the sun during the day and get frozen at night. So, it is this mass of air that has made the temperature on the earth survivable.

Complete step-by-step answer:
Air surrounds earth as thick a blanket called as the atmosphere. Nitrogen and oxygen are two gases which make up the bulk of the atmosphere whereas carbon dioxide, helium, ozone, argon and hydrogen are found in minute quantities. Other than these gases, tiny dust particles are also found in the air. The pie chart shown below gives the percentage of different constituents of air.

Our atmosphere is divided into five layers initiating from the earth’s surface. These are: Troposphere, Stratosphere, Mesosphere, Thermosphere and Exosphere.
Troposphere Is the most important layer of the atmosphere, having an average height of 13 km. The air we breathe exists here and almost all the weather phenomena like rainfall, fog and hailstorm takes place in this layer.
The Stratosphere lies above the troposphere and extends up to a height of 50 km. It has no clouds and associated weather phenomenon, thus making conditions most suitable for flying aeroplanes. It contains a layer of ozone gas which protects us from the harmful effect of the sun rays.
Mesosphere is the third layer of the atmosphere that lies above the stratosphere and extends up to the height of 80 km. Here, meteorites burn up on entering from space.
Thermosphere is the layer in which temperature rises very rapidly with increasing height. The Ionosphere is its part and extends 80-400 km. This layer helps in radio transmission as radio waves transmitted from the earth are reflected back to the earth through this layer.
Exosphere is the upper most layer of the atmosphere. This layer has very light air like helium and hydrogen float here.

Hence, the correct option is (C).

Note: Also, the atmosphere has suitable temperatures like not just cooling or heating, it has many seasons on that basis. Those are rainy, autumn, spring, winter and summer. As we go up the layers of atmosphere, the pressure falls down rapidly. The air pressure is highest at sea level and decreases as height increases.