Weathering.

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EQ: What is chemical and mechanical weathering?

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Presentation transcript:

Weathering

Weathering Vocabulary Physical Weathering Chemical Weathering Oxidation Acid Precipitation Ice Wedging Abrasion Construction Destruction Sediment Erosion Gravity Deposition

Process by which rocks are broken down physically or chemically Weathering Process by which rocks are broken down physically or chemically

Mechanical Weathering Rock is physically (something hitting it) broken down into smaller pieces. Physical_Weathering.asf

Mechanical Weathering What are the agents (causes) of mechanical weathering?

Causes of Mechanical Weathering Ice (ice wedging – freezing and thawing) Wind - Abrasion (the grinding of rock by other rock carried by wind, water, gravity, or ice.) Water - Abrasion Gravity - Abrasion Plants and Animals - burrowing

Rock breaks down through chemical reactions. Chemical Weathering Rock breaks down through chemical reactions. Chemical_Weathering.asf

What are the agents (causes) of chemical weathering?

Agents of Chemical Weathering (Weak Acids) Water (dissolves rock) Air (oxidation from oxygen = rust) Carbon Dioxide (carbonic acid in caves) Living Organisms (produce acids like lichens) Acid Precipitation (rain, snow, sleet, or hail with acid from fossil fuels)

Mechanical AND Chemical Weathering (plant roots push and make acid, water) http://humanities.cqu.edu.au/geography/GEOG11023/week_5_textbook.htm #1

Mechanical Weathering (ice) http://www. kidsgeo #2

Mechanical Weathering (Wind by abrasion) http://adorons #1

Chemical AND Mechanical Weathering (plant acid and plant roots) http://www.earth.ox.ac.uk/~oesis/field/index.html #2

Mechanical Weathering (wind and abrasion) http://www. uh #1

Chemical Weathering (acid precipitation) http://marlimillerphoto #2

Chemical Weathering (acid precipitation) http://www. ux1. eiu #1

Chemical Weathering (water dissolves limestone) http://www. cartage #2

Chemical Weathering (lichens) http://www. cartage. org #1

Chemical Weathering AND Mechanical Weathering (wind and oxidation – rust) http://www.cartage.org.lb/en/themes/sciences/earthscience/geology/soils/FormationSoils/WeatheringSoils/ChemicalWeathering/chemicalweathering.htm #2

What affects the rate rock weathers? Type of Rock Mineral composition – some minerals dissolve faster than others. Permeable rock weathers easily because made of small air pockets. Climate (average weather condition) Wet, hot climates = faster weathering Dry, cool climates = slower weathering