Answer the following questions in brief:

(a) In which form is water present in the atmosphere?

(b) Which source of water contains the highest concentration of salt in it ?

(c) What possible impurities does rain water contain?

(d) What is water table?

(a) Water is present in liquid form under normal conditions.

(b) Ocean and sea water contains the highest concentration of salt in it.

(c) The impurities present in rain water are dust and dissolved, non-poisonous gases of air.

(d) The level of ground water is is known as water table.