Earth's Atmosphere

Dear Samarth,

There air in the atmosphere contains several different gases. A lot of it is Nitrogen, Oxygen comprises about 21% of the earth's atmospheric. The clouds and water vapors comprises only about 1% of the earth's atmosphere. You remember the periodic table book that we have, which contains a list of elements. All these gases and everything that we see arounds us is formed from the elements. The elements combine together to form compounds. For e.g. H2O, water molecule comprises of two Hydrogen element and one Oxygen. The picture below shows the composition of earth's atmosphere:

You can read more about Earth's atmosphere here.

Love 

Papa