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WeatheringThe process of breaking down of rocks into smaller and smaller pieces of rock. These
small pieces are known as sediment. Sediment breaks down further and becomes
soil.
YehliuTaiwan-HoneycombWeathering180px-GeologicalExfoliationOfGraniteRock
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Mechanical/ Physical Weathering
Chemical Weathering
Types of Weathering
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Ice Wedging- Water in the cracks of rocks freeze
Abrasion- Particles of sand are carried by the wind and water
Plant Action – roots from plants grow in the cracks of rocks
Release pressure – when pressure is removed from rocks
Types of Mechanical Weathering
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Chemical Weathering
The process in which the chemical makeup of a rock is changed by a chemical reaction.
http://en.wikipedia.org/wiki/Weathering#Chemical_weathering
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Types of Chemical Weathering
Oxidation – a chemical change that occurs when oxygen and iron form.
Acids – natural acids break down rock.
http://en.wikipedia.org/wiki/Stalagmite
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ErosionErosion takes rocks and other particles from
one location and puts them in another.
Weathering is breaking up rocks erosion is carrying them away.
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The Agents of Erosion
WindWaterGlaciersGravity / Mass Movement
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Wind ErosionWind can carry sand, silt, and clay from one place and deposit it in another.
This type of erosion is most frequent in dry areas with little or no vegetation.
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Wind Erosion
http://upload.wikimedia.org/wikipedia/en/1/15/Mesquite_Sand_Dunes.JPG
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Water Erosion
The most important agent of erosion is running water.
Water runs down hill and form a gully by taking away sediment.
Water continues to flow in the gully and eventually forming a valley.
Water can cause erosion of the shore line can be from waves in the ocean.
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Water Erosion
http://en.wikipedia.org/wiki/Image:Gully_ElPasoCounty_CO_USA.jpg
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Water Erosion
http://en.wikipedia.org/wiki/Image:Wavecut_platform_southerndown_pano.jpg
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Glaciers Erosion
Glacier Erosion is sometimes referred to as Ice Erosion
Glaciers move slowly across land picking up large rocks and even larger boulders.
Glaciers can cause deep valleys to form as they move across the land.
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Glaciers Erosion
http://en.wikipedia.org/wiki/Image:Glacier_mouth.jpg
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Gravity/Mass Movement Erosion
Gravity is the force behind Water and Glacier Erosion
Gravity alone can cause Erosion
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Gravity/Mass Movement Erosion
http://en.wikipedia.org/wiki/Erosion#Gravity_erosion
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Slump CreepRockfallsRockslidesMudflowsLandslides
Types of Gravity/Mass Movement Erosion
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Slump
http://geology.about.com/library/bl/images/blslump.htm
http://geology.about.com/library/bl/images/blslump.htm
A slump occurs when a mass of land slips and moves down a slope.
A slump occurs when the slope becomes too steep and the material under it can not support the ground above it.
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Creep
Sediment slowly moves down hill.
Leaning trees and fence post are clues that creeping is occurring
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Rockfalls
Occur when parts of a rock break off a tumble through the air.
http://www.seismo.ethz.ch/hazard/risk/PaleoSeis/rockfalls2.htm
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Rockslides
http://www.grisda.org/origins/11090.htm
Large and small rock slide down a slope.
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Mudflows
http://en.wikipedia.org/wiki/Image:Mudflow_mailboxes.jpg
Happen after heavy rains.More likely to occur when there is a lack of vegetation.Gravity pulls on the heavy water saturated sediment and causes it to flow down hill.
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Landslides
http://www.signonsandiego.com/news/state/20050601-1811-wst-lagunalandslide.html
A movement of land down a slope.
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Deposition
http://education.usgs.gov/lessons/schoolyard/RockSedimentary.html
Process by which sediments, soil and rocks are added to a landform or land mass (the end of erosion).