Water Cycle

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by Hope Rees3 views·Updated Aug 9, 2023
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  1. Hey everybody. My name is Hope Rees
  2. and I'm going to be doing my present, present presentation on the water cycle.
  3. This would lesson would be best fit for second grade.
  4. So first we'll start by going over our state standard.
  5. Um And that is geo dot Ess two earth systems and
  6. it's part c the rolls of water and earth surface processes.
  7. I'm sorry, this is a little hard to see, but
  8. the student will be able to tell the teacher the four steps
  9. in the water cycle and describe what happens at each step.
  10. And that is the student objective for today.
  11. The first step in the water cycle is evaporation.
  12. Evaporation is when water turns from a liquid to a gas
  13. evaporation happens when the sun heats the water on the surface of the earth
  14. causing the water to turn from a liquid to a gas called water vapor.
  15. And water vapor is colored blue because that is
  16. a word that you will see often in this prey
  17. presentation,
  18. hot air rises. So the water vapor is carried high into the sky.
  19. A fact about
  20. evaporation is that
  21. I that I pulled from UCAR Center for Science education is that a drop of
  22. water may spend over 3000 years in the ocean before evaporating into the air.
  23. But a drop of water spends an average of just
  24. nine days in the atmosphere before falling back to earth.
  25. Our next step in the water cycle is condensation.
  26. Condensation is when water vapor turns back into a liquid such as water,
  27. the water forms droplets on the cold surface.
  28. When humid air is in contact with it forming clouds,
  29. condensation may be a word that you might have heard and you're familiar with.
  30. Um, so
  31. you could
  32. hear this word often, especially during the summer.
  33. Um So an example of condensation is that
  34. when you take a water bottle out of the fridge, the bottle sort of sweats, it gets wet.
  35. Um The bottle will make your hands wet to the touch.
  36. Um And if you were to wipe it off with a paper towel or such,
  37. the paper towel would get wet.
  38. Another example of connotation is when you wake up
  39. in the morning from a previously hot day, such as now,
  40. um I've actually seen my windows doing this.
  41. So the water on your windows when you wake up may look wet,
  42. like maybe it had rained the night before. But that's not the case.
  43. This is because the temperature at nighttime is a lot colder or cooler than
  44. during the day because
  45. causing water droplets to form.
  46. The third step in the water cycle is precipitation.
  47. This is most commonly referred to as snow or rain.
  48. But there are some other names that um can be used
  49. for precipitation that we will talk about in the next slide
  50. here on the left, you have some visuals of what precipitation may look like.
  51. So you have rain, sleet, hail and snow
  52. and like I said, rain and snow are gonna be your most common
  53. um forms of precipitation. But occasionally in
  54. the winter, you will see sleet and hail.
  55. You actually may see hail during tornado season,
  56. especially here in Tennessee because sometimes when it tornadoes, it'll hail.
  57. But
  58. as the clouds cool even more than they do in condensation,
  59. larger droplets of moisture form,
  60. these droplets are heavy enough to fall from the air as rain.
  61. If the air reaches a freezing temperature, the water will turn from the,
  62. the water will freeze, turning into snow sleet or hail.
  63. So if you look up into the sky on a rainy day,
  64. you will see dark clouds and these clouds are gonna be heavier than the clouds that
  65. you would see on a regular day where it's not raining where the clouds look white.
  66. The fourth step in the water cycle is transpiration.
  67. Transpiration is when plants suck water from roots,
  68. releasing vapor into the atmosphere,
  69. the plant uses the water, it needs to survive, then releases the rest into the air.
  70. And here on your right is a little picture that you can use as
  71. a visual for this because I know that it can be a little bit confusing
  72. but the water is absorbed at the roots
  73. and then it travels up through the stem
  74. and then the water will the water vapor that it doesn't use,
  75. it's gonna release from the leaves.
  76. So after precipitation
  77. and during the transpiration stage, some of the rain will soak into the ground.
  78. Um and it makes its way through rocks until
  79. it reaches a river or seeps from the ground.
  80. Making a spring
  81. a spring might not be something that
  82. you have seen before or heard of.
  83. But basically, when the water pressure from the rain builds up in the ground,
  84. it'll kind of make like a puddle which will eventually turn
  85. into a spring which is much bigger than a puddle.
  86. Um Eventually all the water collects into rivers and lakes and
  87. flows downhill to the sea to complete the water cycle.
  88. And lastly, I just have my,
  89. um, references that I've used for some of the pictures and, um,
  90. the quote that I pulled from the internet,
  91. but that completes the water cycle. I hope you enjoyed my pre
  92. presentation.