Air

Do you know that the air we take in while breathing is actually a mixture of many gases?Nitrogen and oxygen are two gases which make up the bulk of the atmosphere. Carbon dioxide, helium ,ozone,argon and hydrogen are found in lesser quantities. Apart from these gases.tiny dust particles are also present in the air.The pie chart gives you the percentage of different constituents of air.

Nitrogen is the most plentiful gas in the air.When we inhale.we take some amount of nitrogen into our lungs and exhale it.But plants need nitrogen for their survival. They can not take nitrogen directly from the air.Bacteria, that live in the soil and roots of some plants,take nitrogen from the air and roots of some plants,take nitrogen from the air and change its from so that plants can use it.

Oxygen is the second most plentiful gas in the air.Humans and animals take oxygen from the air as they breathe. Green plants produce oxygen during photosynthesis. In this way oxygen content in the air remains constant.if we cut trees then this balance gets disturbed.

Carbon dioxide is another important gas.Green plants use carbon dioxide to make their food and release oxygen. Humans or animals release carbon dioxide. The amount of carbon dioxide released by humans or animals seems to be equal to the amount used by the plants which make a perfect balance. However, the balance is upset by burning of fuels,such as coal and oil.They add billions of tons of carbon dioxide into the atmosphere each year.As a result,the increased volume of carbon dioxide is affecting the earth's weather and climate.