2. Weathering

3. Think back…
What do you remember about weathering and erosion? What did you do in 6th grade?

4. Weathering
The process that breaks down rocks and other materials of Earth’s crust into smaller pieces.

5. Weathering can happen two different ways - Physical and Chemical

6. Physical Weathering
Rock is physically broken down into smaller pieces, it is still rock

7. There are five types of physical weathering

8. Write the type of weathering here (it will be numbered in the slides)
How to fill in notes
Write the type of weathering here (it will be numbered in the slides)
After viewing the sample slides, you will create your own picture (label it if necessary

9. 1. Freezing and thawing

10. Frozen soda cans

11. Frost Wedging

12. Frost Heaving

13. Draw it
Create a model (drawing) of how freezing and thawing can physically break rocks into smaller pieces.

14. 2. Plant Growth

16. This is how paper beats rock!

17. Draw it
Create a model (drawing) of how plant growth can physically break rocks into smaller pieces.

18. 3. Animal Actions

19. Burrowing of Animals

20. Draw it
Create a model (drawing) of how animal actions can physically break rocks into smaller pieces.

21. 4. Friction and impact
River rocks are rounded and smoothed due to the repeated tumbling along the river bed as they roll downstream

22. Evidence of past liquid water on Mars!

23. Draw it
Create a model (drawing) of how friction and impact can physically break rocks into smaller pieces.

24. 5. Temperature Changes
Rocks expand (get bigger) when they are hot, and contract (get smaller) when they are cold.

25. This brick wall has expanded and there is a visible crack

27. Draw it
Create a model (drawing) of how temperature change can physically break rocks into smaller pieces.

28. Chemical Weathering
The process that breaks down rock through chemical changes. It is dissolved and is no longer rock.

29. https://www. youtube. com/watch
chemical weathering examples

30. There are five types of chemical weathering

31. 1. Water
Water weathers rock by dissolving it, it is no longer pieces of rock.

32. Draw it
Create a model (drawing) of how water can chemically dissolve rocks into smaller pieces.

33. 2. Oxygen
Iron combines with oxygen in the presence of water in a processes called oxidation
The product of oxidation is rust

34. Draw it
Create a model (drawing) of how oxygen can chemically dissolve rocks into smaller pieces.

35. 3. Carbon Dioxide
CO2 dissolves in rain water and creates carbonic acid
Carbonic acid easily weathers limestone and marble
carbon dioxide weathering and cycle

36. Draw it
Create a model (drawing) of how carbon dioxide in water can chemically dissolve rocks into smaller pieces.

37. 4. Living Organisms
Lichens that grow on rocks produce weak acids that chemically weather rock

38. Draw it
Create a model (drawing) of how living organisms can chemically dissolve rocks into smaller pieces.

39. 5. Acid Rain
Chemicals from burning coal, oil and gas react chemically with water forming acids.
Acid rain causes very rapid chemical weathering

41. Draw it
Create a model (drawing) of how acid rain can chemically dissolve rocks into smaller pieces.

42. All this weathering can create interesting landforms

43. Formation of Devil’s Tower, Wyoming

44. Karst Topography
A type of landscape in rainy regions where there is limestone near the surface
Created by chemical weathering of limestone

45. Features of Karst: Sinkholes

46. Guatemala City sinkhole, 2010
underwater sinkhole
Corvette Museum sinkhole
Sinkhole for rent

47. Features of Karst: Caves

48. Features of Karst: Disappearing Streams

49. Summary: What does weathering have to do with the rock cycle?

50. Card Sort