1. Weathering

2. Weathering Vocabulary
Physical Weathering
Chemical Weathering
Oxidation
Acid Precipitation
Ice Wedging
Abrasion
Construction
Destruction
Sediment
Erosion
Gravity
Deposition

3. Process by which rocks are broken down physically or chemically
Weathering
Process by which rocks are broken down physically or chemically

4. Mechanical Weathering
Rock is physically (something hitting it) broken down into smaller pieces.
Physical_Weathering.asf

5. Mechanical Weathering
What are the agents (causes) of mechanical weathering?

6. Causes of Mechanical Weathering
Ice (ice wedging – freezing and thawing)
Wind - Abrasion (the grinding of rock by other rock carried by wind, water, gravity, or ice.)
Water - Abrasion
Gravity - Abrasion
Plants and Animals - burrowing

7. Rock breaks down through chemical reactions.
Chemical Weathering
Rock breaks down through chemical reactions.
Chemical_Weathering.asf

8. What are the agents (causes) of chemical weathering?

9. Agents of Chemical Weathering (Weak Acids)
Water (dissolves rock)
Air (oxidation from oxygen = rust)
Carbon Dioxide (carbonic acid in caves)
Living Organisms (produce acids like lichens)
Acid Precipitation (rain, snow, sleet, or hail with acid from fossil fuels)

10. Mechanical AND Chemical Weathering (plant roots push and make acid, water) #1

11. Mechanical Weathering (ice) http://www. kidsgeo#2

12. Mechanical Weathering (Wind by abrasion) http://adorons#1

13. Chemical AND Mechanical Weathering (plant acid and plant roots) #2

14. Mechanical Weathering (wind and abrasion) http://www. uh#1

15. Chemical Weathering (acid precipitation) http://marlimillerphoto#2

16. Chemical Weathering (acid precipitation) http://www. ux1. eiu#1

17. Chemical Weathering (water dissolves limestone) http://www. cartage#2

18. Chemical Weathering (lichens) http://www. cartage. org#1

19. Chemical Weathering AND Mechanical Weathering (wind and oxidation – rust) #2

20. What affects the rate rock weathers?
Type of Rock
Mineral composition – some minerals dissolve faster than others.
Permeable rock weathers easily because made of small air pockets.
Climate (average weather condition)
Wet, hot climates = faster weathering
Dry, cool climates = slower weathering