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Water: Our Most Important Natural Resource

Water: Our Most Important Natural Resource. Essential Questions:. How much of our planet is covered by water? Why is fresh water so important? How much fresh water is on earth? So, why can’t we just drink sea water?. Enduring Understandings:.

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Water: Our Most Important Natural Resource

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  1. Water: Our Most Important Natural Resource © The GlobalEd 2 Project

  2. Essential Questions: • How much of our planet is covered by water? • Why is fresh water so important? • How much fresh water is on earth? • So, why can’t we just drink sea water? © The GlobalEd 2 Project

  3. Enduring Understandings: • ~70% of the Earth’s surface is covered by water. • ~70% of the human body is made up of water; fresh water is essential for the survival of all ecosystems; a person can only live without water for ~2-4 days; but can live without food for weeks. • There is a limited amount of fresh water on Earth. • The high concentration of salt in seawater can lead to heart failure and even death. © The GlobalEd 2 Project

  4. Types of Water • Salt water (contains ~ 3.5% NaCl) Major sources – oceans, seas *~ 97% of Earth’s water is salt water • Fresh Water (contains ~ < 1% NaCl) Major sources – ponds, lakes, rivers, streams; precipitation from the atmosphere, as mist, rain or snow © The GlobalEd 2 Project

  5. Fresh Water • Only ~ 2.75% water on Earth is fresh water! • ~ 2/3 of that is frozen in glaciers • ~ 1/4 is groundwater • Only ~ 0.005% is surface water * Hence, less than 1% is fresh water that we can actually use • Fresh water lakes (i.e., Lake Baikal in Russia and the Great Lakes in North America), contain 7/8 of this fresh surface water © The GlobalEd 2 Project

  6. Interpreting: Read the following sailor’s poem; explain the author’s meaning. “Water, water, everywhere, And all the boards did shrink; Water, water, everywhere, Nor any drop to drink." (fromSamuel Taylor Coleridge's The Rime of the Ancient Mariner) © The GlobalEd 2 Project

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