1.
Nitrogen is obtained from the fractional distillation of liquefied air at about

2.
A greenhouse gas that absorbs energy and maintains the earth's temperature is

3.
The main constituent in air is

4.
On cooling, a liquid will be changed into

5.
Combustion cannot take place without

6.
Breathing is a process that refers to the inhaling and exhaling of

7.
Greenhouse gases and other harmful gases are bringing huge damage to the atmosphere like

8.
The process of burning under the presence of oxygen is known as

9.
In desert areas, the water vapor content is

10.
To perform fractional distillation of air, it must be liquefied and then purified to remove

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