1. Chemical Weathering What is it? How does it happen? What do the effects look like? What is it? How does it happen? What do the effects look like?

2. Chemical Weathering  Chemical weathering is… …breaking down rock by chemical changes  Chemical weathering is… …breaking down rock by chemical changes

3. What factors contribute to chemical weathering?  Water  Oxygen  Carbon dioxide  Living things produce chemicals  Acid rain  Water  Oxygen  Carbon dioxide  Living things produce chemicals  Acid rain

4. Water  Water is the most important cause of chemical weathering. Water breaks down rock by DISSOLVING it:

5. Chemical Weathering: water

6. Chemical weathering: oxygen  Oxygen can cause chemical changes to rock: rocks that contain iron look rusty

7. Chemical weathering: oxygen  Rocks that contain copper tend to turn green:

8. Chemical Weathering  The atmosphere naturally contains CO 2  Carbon dioxide in the atmosphere is dissolved by rainwater, and can cause both man-made and natural features to chemically weather.  The atmosphere naturally contains CO 2  Carbon dioxide in the atmosphere is dissolved by rainwater, and can cause both man-made and natural features to chemically weather.

9. Chemical weathering: plants and microbes  Living things produce acids that can speed up weathering:

10. Chemical weathering: acid rain  The CO 2 and sulfur compounds in the atmosphere have increased significantly since the industrial revolution: