erosion & deposition mr. skirbst life science topic 21
TRANSCRIPT
Erosion & Deposition
Mr. SkirbstLife Science
Topic 21
Erosion
Movement of particlesfrom place to place
Deposition
Settling of particlesin a new place
5 Agents of Erosion
5 Agents of Erosion1. Gravity
5 Agents of Erosion1. Gravity2. Wind
5 Agents of Erosion1. Gravity2. Wind3. Water (running on surface)
5 Agents of Erosion1. Gravity2. Wind3. Water4. Ice
5 Agents of Erosion1. Gravity2. Wind3. Water4. Ice5. Waves
Other Agents of Erosion
Biological activityExtraterrestrial Material
1 - Gravity
1 - GravityMass wasting – downhill
movement of sediments
1 - GravityMass wasting – downhill
movement of sedimentsExamples:1- landslides2- mudslides3- avalanche
2 - Wind Erosion (Aeolian)Deflation – movement of loose
material (clay, silt, sand)- small particles carried farther that larger
2 - Wind Erosion (Aeolian)Abrasion – wearing away and
“blasting” of exposed rock
2 - Wind DepositionDunes – mound of sand
deposited by wind
2 - Wind DepositionLoess – fine sand and silt
deposited in layers far from place of origin
3 - Running Water3 Forms of erosion1. Runoff – flow of water over
the land surface
3 - Running Water1. RunoffFactors affecting runoff:
3 - Running Water1. RunoffFactors affecting runoff:a. – rainfall amount
3 - Running Water1. RunoffFactors affecting runoff:a. – rainfall amountb. – shape / slope of land
3 - Running Water1. RunoffFactors affecting runoff:a. – rainfall amountb. – shape / slope of landc. – plant growth & density
3 - Running Water1. RunoffFormations from runoff:
3 - Running Water1. RunoffFormations from runoff:a. – rills: tiny grooves in ground
3 - Running Water1. RunoffFormations from runoff:a. – rills: tiny grooves in groundb. – gullies: wide, deep rills
3 - Running Water2. Streams – flow of water
through a small valley (deep gully)
3 - Running Water2. Streams – flow of water
through a small valley (deep gully)- formed from gullies joining
3 - Running Water2. Streams – flow of water
through a small valley (deep gully)- formed from gullies joining
Streamload – particles carried by stream water
3 - Running Water3. Rivers– flow of water
through a valley formed by streams joining together
3 - Running Water3. Rivers– flow of water
through a valley formed by streams joining togetherTributaries – rivers that flow into a major river
3 - Running Water3. Rivers– flow of water
through a valley formed by streams joining togetherTributaries – rivers that flow into a major riverWatershed – entire area drained by a single river
4 – Ice Glaciers –
Valley glaciers in mountain regions carve out mountains
4 – Ice Glaciers –
Valley glaciers in mountain regions carve out mountainsContinental glaciers during ice ages created a erosional and depositional features
5 – WavesOceans – result in coastal
erosion due to long-shore drift, waves, and storms