Water cycle drawing

  1. Water Cycle Diagram
  2. The water cycle (article)


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Water Cycle Diagram

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The water cycle (article)

The pie chart shows that 97.5% of water on Earth, or 1,365,000,000 kilometers cubed, is salt water. The remaining 2.5%, or 35,000,000 kilometers cubed, is fresh water. Of the fresh water, 68.9% is frozen in glaciers or permanent snow cover. Groundwater—such as soil moisture, swamp water, and permafrost—account for 30.8%. The remaining 0.3% is in lakes and rivers. Many living things depend on this small supply of surface fresh water, and lack of water can have serious effects on ecosystems. Humans, of course, have come up with some technologies to increase water availability. These include digging wells to get at groundwater, collecting rainwater, and using desalination—salt removal—to get fresh water from the ocean. Still, clean, safe drinking water is not always available in many parts of the world today. Most of the water on Earth does not cycle—move from one place to another—very rapidly. We can see this in the figure below, which shows the average time that an individual water molecule spends in each of Earth’s major water reservoirs, a measurement called residence time. Water in oceans, underground, and in the form of ice tends to cycle very slowly. Only surface water cycles rapidly. Bars on the graph show the average residence time for water molecules in various reservoirs. The residence time for glaciers and permafrost is 1,000 to 10,000 years. The residence time for groundwater is two weeks to 10,000 years. The residence time for oceans and seas is 4,000 years. The...