1. Physical Processes
Natural events that affect the environments of regions.

2. Weathering
Chemical or physical process that breaks down rocks into smaller pieces

3. Weathering Mechanical weathering:
Processes that break rock into smaller pieces without changing the composition of the rock
Ex. Ice, plant roots, human activities
More common in dry areas

4. Weathering Chemical weathering:
Process when the rock is changed into a new substance
Ex. rusting
More common in warm, moist climates

6. Erosion
The movement of weathered rock and material by wind, glaciers, and moving water.

7. SOIL EROSION WIND water GLACIATION
Weathered material moved by wind, water, ice, or gravity
water
Flowing in a stream picking up loose light particles
WIND
Similar to water (the greater the speed the larger the particles that can be carried)
GLACIATION
Changing landforms by slowly moving glaciers (large, long-lasting mass of ice that moves b/c of gravity)

8. EROSION Water erosion The movement of weathered material by water
Reshapes landforms by depositing or removing sediment

9. EROSION Wind erosion The movement of weathered material by wind
Reshapes landforms by depositing or removing sediment

10. EROSION Glaciation The movement of weathered material by glacier
Reshapes landforms by depositing or removing sediment
Carves the land dramatically

11. Delta Abrasion- heavier particles grinding away the rock
A valley cut by a stream continues to get deeper and wider
As the water slows, it drops the sediment which is deposited in a fan-like landform
Delta
Abrasion- heavier particles grinding away the rock

12. Coastline before and after Ike

13. Glaciers move from the highest point to the lowest point
Wind is similar to water
The greater the speed the larger the particles that can be carried
Glaciers move from the highest point to the lowest point

14. Soil-building Desertification
an expansion of dry conditions to moist areas that are next to deserts
Dry soil = poor agriculture

19. The Sahel: “shore of the desert”

21. Hydrological Cycle
Water evaporates into the atmosphere from oceans, plants, etc
The vapor in the atmosphere cools, condenses, and falls to the earth as precipitation
Water soaks into the ground, evaporates to the atmosphere, or flows into rivers to be recycled

22. Hydrologic cycle #3