BIOL 43800 Lecture Notes - Lecture 17: Nasa Earth Observatory, Water Vapor, Water Cycle

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Water has an enormous importance to earth as it covers around 75% of its surface. Following precipitation, water can begin the cycle again and start the evaporation. First, water goes through a process known as evaporation which allows it to enter the. The nasa earth observatory states that water is the only substance that can exist as a (graham, 2010). It is constantly moving and going through a cycle known as the hydrologic cycle. According to foundations of earth science , the water content of the earth is approximately 1. 36 billion cubic kilometers (lutgens, 2017). It is available through oceans, ice and glaciers, fresh groundwater and is even an essential part of the human body. Water has an essential role in the environment and nourishment of plants and animals so it is important to understand its cycle and movement throughout the earth. gas, liquid and solid in a natural state (graham, 2010).

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