Erosion & Deposition
1) What is it?
2) What can cause it?
3) How does erosion change the surface of the Earth?-
EROSIONErosion= movement of sediment by ice, wind, water, or gravityIs erosion constructive, destructive, or both? Why?
Erosion wears down Earths surfacegullyErosion is a destructive force.river valley
CAUSES of EROSION
Ice (Glaciers) Glaciers carry materials along as they move forward
ICE EROSION EFFECTSICEa. U shaped Valleyb. Flat Plains
CAUSES of EROSIONWIND carries (blows) sediments and soil from one place to another
WIND EROSION EFFECTSWIND a.Reshaped surfaces b.Sand storms c.Dust storms
CAUSES of EROSION
Moving water in streams & rivers carries sediments along as it moves down stream.The faster the water, the more and the heavier material it can carry
WATER EROSION EFFECTSKARST LandscapeKarst is an area of land that is mostly made of limestone & because of this usually has a lot of caves & sinkholes.
WATER EROSION EFFECTScaves
WATER EROSION EFFECTSCaves are formed when rock is chemically dissolved and carried away by groundwater or underground rivers leaving holes in the rock.
WATER EROSION EFFECTSsinkholesSinkholes form when the rock underneath the soil, is eroded away & the and above sinks because it is no longer supported
WATER EROSION EFFECTSRiver valleys & canyonsare formed when fast moving rivers erode the land over long periods of time.
EROSION EFFECTSFloodplains are formed over time when a river or stream overflows its regular banks and erodes the land around it.
CAUSES of EROSIONGravityCauses water and glaciers to move downhillparticles (sediments, dust, soil, etc.) carried by water and wind to settle on bottom on stream or the ground
GRAVITY EROSION EFFECTSMudflowsLandslidesMass Movement
1) What is it?
2) How can deposition change the surface of the Earth?-
DepositionDeposition= build up of land through the dropping off of sediments that are being carried by ice, wind, water or gravityIs deposition constructive, destructive, or both? Why?
DepositionDeposition is constructive because it builds up Earths surface
DEPOSITION NONLIVING CAUSESICE Glaciers deposit sediments as they begin to melt (recede)
FORCES OFEROSION & DEPOSITIONWIND When the wind slows down, the sediments are depositedThe heaviestsediments are dropped first
Deposition EffectsWindSand dunes
DEPOSITION NONLIVING CAUSESWATER-When the water slows down, the heaviest sediments are deposited firstOlder rivers have curves called meanders.
Canarvon Gascoyne Delta Shark Bay W Australia
stalagmites, & stalactites (ground)(ceiling) WATER
Constructive and Destructive Forces ReviewDestructiveForces that tear down/wear away Earths surface
Examples:Weathering ErosionConstructiveForces that build up Earths surface
*Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.*Have students discuss these questions as a class. Then have the students choose an appropriate definition to write. (Guide them to correct definition). The write down some of the possible causes that the students think cause weathering.