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5th Grade-Ch. 9 Lesson 3 What is weathering

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5th Grade-Ch. 9 Lesson 3 What is weathering

  1. 1. Ch. 9 Lesson 3 What is weathering?
  2. 2. Sugar cubes-Weathering activity <ul><li>Describe the appearance of the sugar cubes. </li></ul><ul><li>Place the sugar cubes in the jar & shake 5 times. </li></ul><ul><li>Pour the contents of the jar onto a piece of paper separating the sugar cubes and the crumbs. (don't eat any of it !!!)   </li></ul><ul><li>Describe any changes you notice in the sugar cubes.  </li></ul><ul><li>Return the sugar cubes to the jar and shake another 5 times. </li></ul><ul><li>Again pour the contents onto a piece of paper separating the crumbs and the cubes. </li></ul><ul><li>Did the second shaking cause the cubes to look more worn?     </li></ul><ul><li>Is the amount of crumbs greater than, the same as or less than the first shaking? </li></ul>
  3. 3. mechanical chemical 2 types of weathering
  4. 4. mechanical weathering <ul><li>breaking of rock  smaller pieces by forces: </li></ul>
  5. 5. <ul><li>gravity </li></ul>
  6. 6. <ul><li>water </li></ul>
  7. 7. <ul><li>ice </li></ul>
  8. 8. ice wedging <ul><li>water freezes in cracks of rock & expands & forces rock to split </li></ul>
  9. 9. Rocks Change [01:13]
  10. 10. <ul><li>plant roots </li></ul>
  11. 11. rate of mechanical weathering on rocks depends on: <ul><li>type of materials in rock </li></ul><ul><li>conditions around it </li></ul>sandstone granite
  12. 12. chemical weathering <ul><li>changes in rock by chemical processes </li></ul>
  13. 13. <ul><li>raindrops absorb CO 2 from air  makes carbonic acid  makes caves </li></ul>
  14. 14. stalactites & stalagmites
  15. 15. The stalactite formed over the bat before the bat decayed.
  16. 16. Weathering [06:58]
  17. 17. soil <ul><li>mixture of sediments : </li></ul><ul><ul><li>weathered rock </li></ul></ul><ul><ul><li>decayed organisms </li></ul></ul><ul><ul><li>gases from air </li></ul></ul><ul><ul><li>water </li></ul></ul>
  18. 18. parts of soil topsoil = fertile b/c large amt. decayed material subsoil = less decayed material bedrock = nearly solid rock  sediments in soil

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