1. WEATHERING

2. Chemical and/or Physical breakdown of rock
Definition
Chemical and/or Physical breakdown of rock

3. Physical Weathering breakdown of rock into smaller pieces (mechanical)
Does not involve a chemical change in the rock

4. Frost Action/Wedging
alternate freezing and thawing due to the expansion of water when freezes = potholes

7. b. Abrasion
Rounding of rocks due to the rocks hitting each other

9. c. Root Action
Roots wedge and grow in rocks

11. d. Exfoliation
Large sheets of loosened rock peel away

17. Chemical Weathering
Breakdown of rock due to a chemical change in the rock
Often requires water
The higher the temperature, the faster the chemical weathering

18. a. Oxidation
Iron + Oxygen
iron oxide, (commonly called rust)

19. b. Carbonation
Carbon dioxide + water = carbonic acid (in rain) – a weak acid
Slowly dissolves Limestone and Marble

20. Karst Topography
Caves and Sinkholes

21.
Karst and corvettes

22. c. Hydration Water plus other minerals
Ex. Feldspar + water will slowly change into clay

24. Factors that Affect
Weathering

25. 1. Particle Size/Surface Area exposed at Surface
The more surface area exposed, the ________ the weathering
quicker

26. Which will weather faster and why?
Why will smaller particles weather faster?
Surface Area and Weathering
Which will weather faster and why?
Pebbles Sand Silt Clay
because it is the smallest

27. 2. Mineral Composition
The harder the rock, the longer it takes to break down
b. Calcite/Limestone >> dissolves in acidic water

30. Which layer, X or Y is more resistant to weathering?
Y, is hasn’t weathered as much

31. 3. Climate Chemical Weathering Physical Weathering
A. Warm, moist climate >>>
B. Moist with temperature variations of freezing and thawing >>>
Chemical Weathering
Physical Weathering