1. Erosion & Deposition

2. Erosion and Deposition
Weathering
the process by which natural forces break down rock and soil

3. Erosion and Deposition
the process by which natural forces move weathered rock and soil from one place to another

4. Erosion and Deposition
Causes of erosion:
Gravity
Running water
Wind
Glaciers

5. Causes of Erosion Gravity
Force that moves rock and other materials downhill
Mass movement—process of moving sediment downhill
May be fast or slow

6. Causes of Erosion Gravity Types of mass movement:
Force that moves rock and other
materials downhill
Mass movement—process of
moving sediment downhill
May be fast or slow
Types of mass movement:
Landslides—rock & soil
slide quickly down a steep
slope

7. Causes of Erosion Gravity Types of mass movement:
Force that moves rock and other
materials downhill
Mass movement—process of
moving sediment downhill
May be fast or slow
Types of mass movement:
Mudflows—rapid downhill
movement of a mixture of
water, rock, and soil

8. Causes of Erosion Gravity Types of mass movement:
Force that moves rock and other materials downhill
Mass movement—process of moving sediment downhill
May be fast or slow
Types of mass movement:
Slump—one large mass of
rock and soil suddenly slips
down a slope

9. Causes of Erosion Gravity Types of mass movement:
Force that moves rock and other materials downhill
Mass movement—process of moving sediment downhill
May be fast or slow
Types of mass movement:
Creep—very slow downhill
movement of rock and soil

10. Causes of Erosion
Running Water
#1 agent of erosion

11. Causes of Erosion Running Water #1 agent of erosion
Types of running water:
Streams
Small streams = creeks
Large streams = rivers
Colorado River
Grand Canyon

12. Causes of Erosion Running Water #1 agent of erosion Types of running
Waves

13. Causes of Erosion
Wind
Blows sediment
Sand dunes
Dust Bowl

14. Causes of Erosion Glaciers Large masses of moving ice Movement
changes the land
beneath them
Alaska

15. Erosion & Deposition Deposition
the natural process of laying down sediments in a new location
creates new
landforms

16. Erosion & Deposition Deposition
deposited sediments are laid down in layers
layers of sediment are
compacted under pressure
and eventually form
sedimentary rock layers

17. Erosion & Deposition Deposition
deposited sediments are laid down in layers
Layers of sediment are compacted
under pressure and eventually form
sedimentary rock layers.
Sedimentary rocks are like ogres and onions…they have layers.

18. Erosion & Deposition Deposition
deposited sediments are laid down in layers
Layers of sediment are compacted
under pressure and eventually form
sedimentary rock layers.
Most fossils are found in sedimentary rocks because organisms get covered and preserved by the layers then mineral replacement occurs over time.

19. Weathering, erosion and deposition are all part of a never-ending cycle that constantly shapes and reshapes the land. Destructive forces—break down Constructive forces—build up

20. Weathering, erosion and deposition are all part of a never-ending cycle that constantly shapes and reshapes the land.
Destructive Forces
Constructive Forces