1. True or False: The Earth’s surface has stayed the same for thousands of years.

2. The Earth’s surface is always changing!
True or False: The Earth’s surface has stayed the same for thousands of years
False
The Earth’s surface is always changing!

4. Still the same rock…

5. Still the same rock…

6. Still the same rock…

7. Still the same rock…but where did it go?

8. HOW DID THIS HAPPEN??

9. The process that breaks rocks down into smaller pieces
Weathering
The process that breaks rocks down into smaller pieces

10. What causes weathering?

11. Water causes weathering
What evidence of weathering do you see in this picture?

12. Wind causes weathering
Why wasn’t this mass of land weathered away?
What evidence of weathering do you see in this picture?

13. Ice causes weathering (ice wedging)
How is ice causing weathering?

14. Plants and animals cause weathering
What are they doing to the rock?

15. Oxygen causes weathering
Why did the bike rust?

16. Two Types of Weathering
Mechanical (Physical) Weathering
The rock is broken up, but it is the same rock in smaller pieces
Example: wind, water, plant roots, and ice
Chemical Weathering
The rock is broken up and changed by chemical reactions
Example: oxidation (RUST!), acid rain

17. Mechanical or Chemical?

18. Mechanical or Chemical?

19. Mechanical or Chemical?

20. Check this out!
This website lets you choose which type of weathering acts on a certain place.
Go!
Weathering is like baking!
Factors that Cause Weathering