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The Water Cycle :
Water evaporates from the oceans as invisible water vapor, leaving behind the salt. The water vapor rises into the atmosphere, which is normally cooler than the sea. Here, it condenses into tiny droplets, which we can see as clouds. When the clouds get cooler still, either by rising higher or by crossing land where they are forced upwards to go over hills and mountains, the tiny droplets join together to form raindrops, which fall to earth. In very cold areas, they freeze on the way downwards and become snow or hail.
The rain, when it falls, does not, of course, remain on the ground. 75 percent of it goes back to the ocean by running into rivers, or soaking into the ground (for storage or discharge) and so back to the sea. Some of the rain 5 soaks into the soil where the roots of plants 'suck' it up to provide minerals for the leaves and branches.
Plants 'breathe' out water vapor from tiny holes in their leaves (transpiration). One hectare of growing maize transpires about 37,000 liters of water a day.
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The water cycle describes how water evaporates from the surface of the earth, rises into the atmosphere, cools and condenses into rain or snow in clouds, and falls again to the surface as precipitation. ... The cycling of water in and out of the atmosphere is a significant aspect of the weather patterns on Earth.