Compare and contrast mechanical and chemical weathering. Explain how weathering affects Earth’s...

Compare and contrast mechanical and chemical

weathering.Explain how weathering affects

Earth’s surface.

Define

weathering surface

processes that break down rock into small pieces called sediment

Explain why over long periods of time, weathering wears mountains down to rolling hills…

Rocks at the tops of mountains are broken down by

weathering, and sediment is moved downhill by gravity,

water, and ice.

Describe mechanical weathering

Physical processes that break rock into fragments with the same chemical makeup and characteristics as the original rock

Identify what can cause mechanical weathering

growing plants burrowing animals expanding ice

Speculate how damage to a sidewalk, due to growing plants, could be avoided…

Plant trees farther away from the sidewalk. Remove large

roots. Build sidewalks farther away from mature trees.

Identify what happens in

ice wedging.

water enters cracks in rock

water freezes and expands

expanding ice breaks rocks apart

Explain why size is important to weathering rock.

Surface area-•Small pieces of rock have more surface area than do larger pieces, which makes them weather faster.

Picture CONT

Explain why size is important to weathering rock.

Describe chemical weathering

Chemical reactions dissolve the minerals in rocks or change them into different minerals.

Explain how carbonic acid weathers rock.

Carbonic acid, formed from water reacting with carbon dioxide, causes calcite in limestone to dissolve (which could form caves).

Explain how kaolinite clay forms.

It forms when natural acids react with feldspar in granite and other rocks. Clay is an end product of weathering.

Explain why groundwater is acidic.

As water seeps through soil, it reacts with carbon dioxide in soil and air to form carbonic acid.

Define

oxidation Chemical

process that occurs when iron is exposed to oxygen in the air

Define climate•Cold climate

•Warm, wet climate

Pattern of weather that occurs over time•Mechanical weathering more rapid in cold climates

•Chemical weathering more rapid in warm, wet climates

Photo creditshttp://www.treknature.com/gallery/Asia/Cambodia/photo111875.htmhttp://thisoldearth.net/Geology_Online-1_Subchapters.cfm?Chapter=5&Row=2http://teach.albion.edu/jjn10/physical-weathering/http://facstaff.gpc.edu/~pgore/geology/geo101/weather.htmhttp://www.studyblue.com/notes/note/n/earth-an-introduction-to-physical-geology-ch-6/deck/3947796http://w3.salemstate.edu/~lhanson/gls210/gls210_weath1.htmhttp://soil99.wikispaces.com/Mechanical+Weatheringhttp://www.ux1.eiu.edu/~cfjps/1300/weathering.html

Photo creditshttp://www.ux1.eiu.edu/~cfjps/1300/

weathering.htmlhttp://sciencerocksav.webs.com/

chemicalweathering.htmhttp://www.metals-b2b.com/b2b/

plastic_pipes/2/http://www.desertusa.com/mag99/feb/

papr/speleothems.htmlhttp://www.scienceclarified.com/

everyday/Real-Life-Chemistry-Vol-2/Oxidation-Reduction-Reactions.html

Compare and contrast mechanical and chemical weathering. Explain how weathering affects Earth’s...

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Transcript of Compare and contrast mechanical and chemical weathering. Explain how weathering affects Earth’s...

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