Monday, February 8, 2010

What happens to the rain

Rain, hail and snow are the means by which water returns to the earth.If this did not happen then the survival of life would not be possible. What becomes of the rain when it has fallen? Some of it falls into the sea andbecomes a part of it again. In this way it helps to replace the water that is always taken up into the air as water vapour. Rain which falls on to the soil of flat areas sinks into it. It fills the small spaces between the grains of soil to a depth of several meters. This is the water that plants use. The roots and the tiny hair on them take up this water and pass it to the stem of the plant. It moves upwards to the leaves where it is used by the plant in its food-making process. The water in the stem and leaves helps tomake them stiff too. The underground water makes an enoumous water store that never completely dries up. Water that is used by plants, ou is taken up into the air as water vapour (both from the surface of the soil and from the leaves of plants) is replaced by more rain. Rain falls on hills and mountains as well as on flat ground. When this happens, the water begins to run down the hills in little rivulets. These rivulets join up and make a small, fast-running stream.Others join it on its way down untill a river is formed. At places, where the ground slopes steeply, the river flows very quickly and tears a deep channel for itself. Later, as the ground becomes less steep, the river makes its channel wider but not so deep. It runs a little more slowly, too. When it reaches low ground, it runs much more slowly and its channel becomes full of twists and turns. In the end, the river reaches the sea and fall in it. Sometimes rivers run over rocks made of limestones. These rivers may plunge down deep holes in the rocks and flow under the ground instead of on the surface. As it flows towards the sea, the water very slowly dissolves the limestone and makes tunnels and caves under the surface. ALL THE BEST YOUR REGARDS, ABDUL SAMAD

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