Many people think it makes no difference how much water we use or what we use it for. But it does. Water is a finite resource. Worse still, most uses actually lower the quality of the water. Wastewater treatment and purification processes can't completely restore water to its original quality, so use water wisely.
Water is simple and complex at the same time.
Pure water has no taste, no colour, no smell, turns to a solid at 0 degrees C and to a vapour at 100 degrees C. All living things, from the tiniest insect to the tallest tree, need water to survive. There are a number of theories that try to explain where water came from. Some believe that water was here from the start. Some think it came later from comets. Many scientists believe that 4.5 billion years ago, when the Earth was being formed, its primitive atmosphere contained many poisonous substances, among them were the basic constituents needed to form water.