1. Weathering and Erosion and Sedimentary Rocks
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2. Weathering and Erosion
What happens to a rock that has been rained on for HUNDREDS of years?
What about a rock that has had STRONG winds blowing on it for hundreds of years?
What about TWO rocks that have been grinding against each other for hundreds of years?

3. Weathering and Erosion
We call the process of rocks wearing down WEATHERING.

4. Weathering and Erosion
What do you think happened to these rocks?

5. Weathering and Erosion
What do you think happened to these rocks?

6. Weathering and Erosion
What do you think happened to this rock?

7. Weathering and Erosion
What do you think happened to this rock?

8. Weathering and Erosion
What do you think happened to this rock?

9. Weathering and Erosion
Weathering usually happens when something slowly SQUEEZES AND PUSHES its way into a rock.
This type of weathering can be caused by water, ice, or plant roots.

10. Weathering and Erosion
Erosion is the process of TRANSPORTING and DEPOSITING small pieces of rock and soil in a new location.

11. Sedimentary
Those small pieces of rock can be glued together to form sedimentary rock.
The cement that holds sediments together are actually MINERAL CRYSTALS, usually from groundwater.

12. Sedimentary

13. Sedimentary
There are two main types:
Well sorted
Poorly sorted

14. Sedimentary
Well sorted
Poorly sorted

15. Where have you seen well sorted particles and pieces of rock before?
Sedimentary
Well sorted
Where have you seen well sorted particles and pieces of rock before?

16. Sedimentary
Sand, like in a desert, can become sandstone after millions of years of cementation

17. Mud (or silt) can be cemented to form shale.
Sedimentary
Mud (or silt) can be cemented to form shale.

18. Gravel can be cemented to form breccia.
Sedimentary
Gravel can be cemented to form breccia.

19. Can you think of somewhere you have seen poorly sorted rocks?
Sedimentary
Poorly sorted
Can you think of somewhere you have seen poorly sorted rocks?

20. This is an example of a poorly sorted sedimentary rock.

21. Landslide debris can be cemented together to form conglomerate rocks
Sedimentary
Landslide debris can be cemented together to form conglomerate rocks

22. Well sorted or Poorly sorted?
Sedimentary
Well sorted or Poorly sorted?

23. Well sorted. The particles are all the same size
Sedimentary
Well sorted. The particles are all the same size

24. Well sorted or poorly sorted?
Sedimentary
Well sorted or poorly sorted?

25. Poorly sorted. The particles in this rock are all different sizes
Sedimentary
Poorly sorted. The particles in this rock are all different sizes

26. Well sorted, or poorly sorted?
Sedimentary
Well sorted, or poorly sorted?

27. Well sorted. The particles in this rock are all very small
Sedimentary
Well sorted. The particles in this rock are all very small

28. Well sorted, or poorly sorted?
Sedimentary
Well sorted, or poorly sorted?

29. Sedimentary
Poorly sorted. There are very large and very small particles in this rock

30. Sample Test Question…
A sample of rock has visible small, round pebbles cemented together with smaller- grained material. Which type of rock is the sample?
A. igneous
B. sedimentary
C. metamorphic
D. Not enough information to answer.