An Introduction to Water

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An Introduction to Water

  1. 1. Foundation Science Today’s Lesson: Water
  2. 2. Importance of Water If there was no water, there would be no life Why is water important? 1) The first life on earth came from water 2) All organisms depend on water to survive A human can live only 3 or 4 days without water!!!
  3. 3. How Much Water is There? Water covers 71% of the earth’s surface Where is water found? 1) Oceans 96.5% 2) Groundwater 1.7% 3) Glaciers 1.7% 4) Lakes about 0.09% 5) Vapor, clouds, precipitation 0.001%
  4. 4. How Much FRESHWATER is There? Freshwater is water without salt; the Chao Praya river is freshwater Only 2.5% of the earth’s water is freshwater, the rest is saltwater from the oceans 99% of the earth’s freshwater is groundwater or ice (snow), 0.3% is in lakes and rivers, and the rest is in animals
  5. 5. THE WATER CYCLE • Water in oceans, lakes rivers or on land evaporates into the air. • It then turns into rain and falls back to the earth and the process begins again…….
  6. 6. WATER VAPOR • Water vapor is water molecules in the air
  7. 7. Evaporation Evaporation is when liquid water turns into water vapor
  8. 8. Condensation • Water vapor turning into liquid water is called condensation • Water vapor condenses when it hits a colder object
  9. 9. Precipitation • PRECIPITATION is the condensed water in the air that falls to earth • PRECIPITATION = RAIN
  10. 10. THE WATER CYCLE
  11. 11. QUESTIONS 1. Draw a picture showing water evaporation, condensation and precipitation. 2. Is there water vapor all around you right now? 3. When you have a cold drink, is it precipitation that forms on the cup, or condensation? 4. Explain in your own words why water forms on the outside of a cold cup. 5. Raindrops need to form on something in the air to make precipitation. What does the water vapor condense onto??

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