Water Cycle Essay

521 Words3 Pages
[pic] [pic]The Water Cycle[pic] Every human, plant, and animal depends on water for survival. Let's explore the Earth's water cycle; what exactly is it? [pic] The water cycle is the way the Earth uses and recycles water. It's controlled by the sun, which produces energy in the form of heat. This heat energy causes the water in the world's oceans, lakes, and even puddles in your backyard to warm and evaporate. When water is heated, it changes from a liquid to a gas. This gas is called water vapor, and the process is called evaporation. When plants give off water vapor, it's called transpiration. When water evaporates, it rises into the cooler air, collects, and forms clouds. There, the water vapor molecules cool down and change back into liquid water. This is called condensation. [pic] As more and more water vapor cools into the clouds, the water droplets that form the clouds become larger and larger. These droplets get so big that the swirling winds in the atmosphere can no longer hold them up. The droplets fall from the sky. Precipitation is the term for the falling, condensed water molecules, which come down as rain, snow, sleet, or hail--depending on conditions in the Review: The water cycle is a process that is constantly recycling the Earth's supply of water. This is important because humans, animals, and plants all need water to survive. To review, let's go through the water cycle step by step: a. First the water from the Earth's surface evaporates. Then it rises into the atmosphere, is cooled, condenses, and forms clouds. b. When enough water collects in the clouds, they release moisture in the form of rain, sleet, snow, or hail. And once again, the water returns to the Earth. c. The water that's fallen to the Earth runs off into lakes, rivers, streams, and any other body of water. This water will eventually seep through layers

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