Deposition, Weathering, and Erosion Weathering What Caused This?
http://commons.wikimedia.org/wiki/File:Toad_Rock_-_geograph.org.uk_-_76 7454.jpg http://en.wikipedia.org/wiki/File:KharazaArch.jpg Effects of Weathering
Weathering is a process that breaks down rock and other substances at Earths surface creates soil softer rock weathers faster weathering is fastest in hot and wet climates
Types of Weathering Mechanical Weathering Chemical Weathering What is Mechanical Weathering? Breakdown of rock into smaller pieces
without any change in the chemical composition of its minerals. Sometimes called physical weathering Rock is torn apart by physical force, rather than by chemical breakdown. Mechanical Weathering
Works very slowly There are different types ice wedging exfoliation thermal biotic
Mechanical - Ice Wedging Ice Wedging Water fills joints of rocks and freezes Freezing expands the water by 10% Repeated freeze and thaw cycles over the years causes rock to break
along joint Mechanical - Exfoliation Exfoliation or unloading Rock breaks off into leaves or sheets along joints which are
parallel to the ground surface Mechanical - Thermal Thermal expansion Repeated daily heating and cooling of rock Different minerals expand and
contract at different rates causing the rock to split Mechanical - Biotic Biotic means life Weathering caused by living organisms
Plant roots, digging animals, microscopic plants and animals, algae and fungi. Mechanical Weathering What is Chemical Weathering? Breakdown of rock into smaller pieces
because of change in the chemical composition of its minerals. Chemical reactions break down the bonds holding the rocks together, causing them to fall apart. Chemical weathering occurs in all types of rock but smaller rocks are more susceptible
because they have a greater amount of surface area. Chemical Weathering Types of chemical weathering
Biotic (living organisms) Acid rain Chemical - Oxidation Oxidation - oxygen combines with other elements in rocks to form new types of rock.
Causes a rusting of the rock, often causes a color change in the rock Chemical - Hydrolysis Hydrolysis - water combines with the substances in rocks to form new types of rock
New substances are softer than the original rock types Chemical - Carbonation Carbonation Carbon dioxide is dissolved in water making carbonic acid, which eats away at the rock
Weak acid is formed when carbon dioxide in the air mixes with rain. This is the same acid found in soft drinks. Chemical - Biotic Organisms - living organisms can cause changes in the chemistry of rock
Plants lower the local pH to make it more acidic Bacteria act as catalysts in various geochemical processes Chemical Weathering
Weathering by Water Most important agent of chemical weathering It can dissolve rock and minerals in rock Weathering by Waves Waves weather the land: Mechanical weathering
Broken down into smaller pieces Chemical weathering Dissolved in water Weathering by Waves
Weathering by Wind Wind weathers the land by mechanical means Abrasion Very slow process
Weathering by Wind weathering The breaking down of rock into smaller pieces that remain next to each other. Weathering forms sediments mechanical weathering
chemical weathering Physical breaking of rock without any change in the chemical composition of the rock.
biotic force ice wedging exfoliation
thermal The breaking down of rock into smaller pieces because of chemical changes within the rock. biotic
oxidation hydrolysis carbonation
Erosion What Caused This? http://commons.wikimedia.org/wiki/ File:Water_erosion_below_Hay_Bluff_-_geograph.org.uk__1074175.jpg
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