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Water is an important need of living beings. Water has no taste and colour. It is a liquid substance. In most of the oceans and seas, water appears green and blue due to natural factors. Water is used for bathing, cooking, drinking, swimming, etc. We cannot survive without water. If we don’t eat food we can survive for a few weeks but if we do not drink water we won’t survive more than a few days. There are different sources of water like sea, ocean, river, pond, etc. Water becomes vapour when we heat.