Our earth is very misterious it is the most amazing     planet in our milky way galaxy. It is different from other planets because life only exist in earth. About three fourth of the earth surface is covered by with sea water  and only 2% of this water is dinkable and from this two percent about 75% of water are in the form of ice found on the poles of the earth. Different species of plant and animals (flora and fauna) are found in earth which exist on earth since  billions of years.