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Unit 4 Air Around Us

Unit 4 Air Around Us. The Water Cycle. Click on picture for neat explanation of the Water Cycle. The water cycle greatly affects weather and living things. Vocabulary: water cycle The movement of water between the ground and the atmosphere.

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Unit 4 Air Around Us

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  1. Unit 4 Air Around Us

  2. The Water Cycle Click on picture for neat explanation of the Water Cycle

  3. The water cycle greatly affects weather and living things Vocabulary: water cycle The movement of water between the ground and the atmosphere

  4. You might think that rain brings new water to Earth But there is no new water on Earth

  5. The first step of the water cycle involves the sun The sun heats water on Earth and changes it from a liquid to gas called water vapor

  6. Vocabulary: water vapor water in the form of a gas

  7. The water vapor goes into the air This process is called evaporation

  8. Vocabulary: evaporation The process by which water changes from a liquid to a gas and goes into the air

  9. It is evaporation that dries a puddle in the sun after the rain

  10. In the second step of the cycle, water vapor in the air changes back to a liquid This happens when warm air holding water vapor gets cooler

  11. This process is called condensation Vocabulary: condensation The process by which water vapor in the air changes to liquid water

  12. The tiny water drops in the air are packed closer and closer together until they start to join

  13. Clouds are formed when thousands of drops are so close together that you cannot see through them Video on “Cool Clouds” 7:15

  14. As clouds become cooler, the drops join together to make bigger drops

  15. Finally, they become heavy enough to fall back to Earth as rain or snow This falling rain or snow is the third step in the water cycle

  16. The word “cycle” usually means circle The water cycle is like a circle because it has no beginning or end Yep you got it another version of “The Water Cycle” 3:37

  17. There really is no new water on Earth Click for Bill Nye the Science Guy “Water Cycle Jump” 1:30

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