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CBSE Class 7 Science - Water and water cycle Class 7 Science   – Water and water cycle Around 70% of the Earth is wrapped in water in the form of ice, seas, oceans, rivers, lakes, ground water and moisture in the surrounding. But large amounts of water is not suitable for man consumption. Only fresh water is fit for human consumption. Means 0.006% of the water is only available for use. Water exists in three forms – Solid, Liquid and gaseous form. As a solid form, it resides as glaciers, snow mountains and ice caps at the poles. As a Liquid form, it exists in oceans, seas, rivers, lakes and ground water. As a gaseous form, water vapors in the air. Water Cycle The continuous process of evaporation, condensation, precipitation, infiltration of water in nature keeps the level of water on the earth constant is called the water cycle.  Now understand Evaporation Evaporation is the process of conversion of water molecules into vapor.Water vapor accumu...