Weathering What is your definition?
Weathering is the breakdown of rocks and minerals on the earth's surface. Many things cause this to happen.  There are two...
What is  mechanical weathering? It is when rocks break down into smaller pieces because of some physical force.  The rock ...
Photo by A. Criminger Freezing and thawing is breaking these rocks apart! Ice Wedging
ice wedging (freezing/thawing)
Photo by A. Criminger Ice is breaking these rocks apart
Photo by A. Criminger Roots are breaking these rocks apart. ROOT PRY
Abrasion
 
Animal action
What is  chemical weathering? Chemical weathering occurs when rocks are broken down by a chemical reaction.  This can happ...
http://web.mala.bc.ca Water can dissolve rocks. http://www.arts.tas.gov.au
http://www.geo.lsa.umich.edu
Oxygen reacts with iron and weathers into rust http://www.raisethehammer.org On rocks On man made objects
Photo by A. Criminger Sometimes rocks are not the only things that get chemically weathered!
Copyright © Bruce Molnia, Terra Photographics   Carbon Dioxide Carbon dioxide combines with water and forms a weak acid.  ...
www.nullarbornet.com.au
Photo by A. Criminger This rock is being broken down by the chemicals in the roots of the lichen growing on the rock.
plant growth http://www.geo.lsa.umich.edu
http://www.cartage.org.lb/ Rates of weathering
Rates of weathering <ul><li>Type of material being weathered </li></ul><ul><li>Climate – warm climates weather material fa...
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Weathering Andie

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Weathering Andie

  1. 1. Weathering What is your definition?
  2. 2. Weathering is the breakdown of rocks and minerals on the earth's surface. Many things cause this to happen. There are two types of weathering: Mechanical (physical) Chemical
  3. 3. What is mechanical weathering? It is when rocks break down into smaller pieces because of some physical force. The rock does not change chemically, it just gets smaller! Sometimes called PHYSICAL weathering.
  4. 4. Photo by A. Criminger Freezing and thawing is breaking these rocks apart! Ice Wedging
  5. 5. ice wedging (freezing/thawing)
  6. 6. Photo by A. Criminger Ice is breaking these rocks apart
  7. 7. Photo by A. Criminger Roots are breaking these rocks apart. ROOT PRY
  8. 8. Abrasion
  9. 10. Animal action
  10. 11. What is chemical weathering? Chemical weathering occurs when rocks are broken down by a chemical reaction. This can happen by water, oxygen, acid rain, and even living things.
  11. 12. http://web.mala.bc.ca Water can dissolve rocks. http://www.arts.tas.gov.au
  12. 13. http://www.geo.lsa.umich.edu
  13. 14. Oxygen reacts with iron and weathers into rust http://www.raisethehammer.org On rocks On man made objects
  14. 15. Photo by A. Criminger Sometimes rocks are not the only things that get chemically weathered!
  15. 16. Copyright © Bruce Molnia, Terra Photographics Carbon Dioxide Carbon dioxide combines with water and forms a weak acid. This acid, over time can dissolve rock.
  16. 17. www.nullarbornet.com.au
  17. 18. Photo by A. Criminger This rock is being broken down by the chemicals in the roots of the lichen growing on the rock.
  18. 19. plant growth http://www.geo.lsa.umich.edu
  19. 20. http://www.cartage.org.lb/ Rates of weathering
  20. 21. Rates of weathering <ul><li>Type of material being weathered </li></ul><ul><li>Climate – warm climates weather material faster. </li></ul>
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