Erosion &
Deposition
Mr. Skirbst
Erosion
Deposition
Settling of particles in a new
place
5 Agents of Erosion
5 Agents of Erosion
1. Gravity
5 Agents of Erosion
1. Gravity
2. Wind
5 Agents of Erosion
1. Gravity
2. Wind
3. Water
(running on
surface)
5 Agents of Erosion
1.
2.
3.
4.
Gravity
Wind
Water
Ice
5 Agents of Erosion
1.
2.
3.
4.
5.
Gravity
Wind
Water
Ice
Waves
Other Agents of Erosion
Biological activity
Extraterrestrial Material
1 - Gravity
1 - Gravity
Mass wasting – downhill
movement of sediments
1 - Gravity
Mass wasting – downhill
movement of sediments
Examples:
1- landslides
2- mudslides
3- avalanche
2 - Wind Erosion (Aeolian)
Deflation – movement of loose
material (clay, silt, sand)
2 - Wind Erosion (Aeolian)
Deflation – movement of loose
material (clay, silt, sand)
- small particles carried
farther than larger
2 - Wind Erosion (Aeolian)
Abrasion – wearing away and
“blasting” of exposed rock
2 - Wind Deposition
Dunes – mound of sand
deposited by wind
2 - Wind Deposition
Loess – fine sand and silt
deposited in layers far from
place of origin
3 - Running Water
3 Forms of erosion
3 - Running Water
3 Forms of erosion
1. Runoff – flow of water over
the land surface
3 - Running Water
1. Runoff
Factors affecting runoff:
3 - Running Water
1. Runoff
Factors affecting runoff:
a. – rainfall amount
3 - Running Water
1. Runoff
Factors affecting runoff:
a. – rainfall amount
b. – shape / slope of land
3 - Running Water
1. Runoff
Factors affecting runoff:
a. – rainfall amount
b. – shape / slope of land
c. – plant growth & density
3 - Running Water
1. Runoff
Formations from runoff:
3 - Running Water
1. Runoff
Formations from runoff:
a. – rills: tiny grooves in ground
3 - Running Water
1. Runoff
Formations from runoff:
b. – gullies: wide,
deep rills
3 - Running Water
2. Streams – flow of water
through a small valley
(deep gully)
3 - Running Water
2. Streams – flow of water
through a small valley (deep
gully)
- formed from gullies
joining
3 - Running Water
2. Streams – flow of water
through a small valley (deep
gully)
- formed from gullies joining
Streamload – particles carried
by stream water
3 - Running Water
3. Rivers–
3 - Running Water
3. Rivers– flow of water
through a valley formed by
streams joining together
Tributaries – rivers that
flow into a major river
3 - Running Water
3. Rivers– flow of water
through a valley formed by
streams joining together
Tributaries – rivers that flow
into a major river
Watershed – entire area
drained by a single river
4 – Ice
Glaciers –
Valley glaciers
in mountain
regions carve
out mountains
4 – Ice
Glaciers –
5 – Waves
Oceans – result in coastal
erosion due to long-shore
drift, waves, and storms