ch 23-2 weathering
Post on 18-May-2015
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Weathering
23.2
Erosion / Weathering
Erosion
• The process that wears down and carries away rock and soil
• Ex. Grand Canyon• Destructive process that
shapes the Earth surface • Works through • Weathering – Gravity• Streams—Groundwater• Glaciers—Wind—Waves
WeatheringWeathering• The Process where
rocks are • chemicallychemically altered or• physicallyphysically broken
down into fragments
Mechanical Weathering
• Mechanical WeatheringMechanical Weathering = Physically breaking rocks
• Frost Wedging
–Water freezes into ice and expands breaking rock
• Abrasion
–Rocks scraping against each other
Mechanical Weathering
• Plant roots–Root grow into rock and
pry rock apart• Release of pressure
–Removing excess material allows for expansion of material allow rocks to crack
Chemical Weathering
•Chemical reactions break down the bonds holding
the rocks together,• causing them to fall apart,
• forming smaller and smaller pieces
Acid Rain
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