1. Weathering and Erosion

2. What’s the difference?
Weathering = chemical or mechanical breakdown of rocks into sediments
Erosion = MOVEMENT of weathered material from one location to another
Occurs by:
Wind
Water
Gravity
Glaciers
Deposition = sediments are laid down or dropped when transportation stops

3. Weathering Breaking of rock into smaller pieces Two types Chemical
mechanical

4. Chemical Weathering Changes the chemical composition of rocks
Rocks can be weathered by:
Water (dissolving)
Acid
Oxygen
CO2

5. Mechanical Weathering
Breaking rocks into smaller pieces
NO change in the chemical composition of the rock
ONLY changes size and shape

6. Erosion
Process by which water, ice, wind, or gravity move sediments

7. Water Erosion Occurs in rivers, streams, and runoff
Natures STRONGEST method of erosion

8. Ice/Glacier Erosion
As glaciers move, they can pick up sediments and transport them.

9. Wind Erosion
Wind can pick up small sediments (sand, clay, silt, etc) and transport them to another location
As sediments are being carried, they can also chip away at rock.

10. Gravitational Erosion
Gravity can cause the movement of large masses of land
Landslides
Mudslides
Slump
creep