compare and contrast mechanical and chemical weathering. explain how weathering affects earth’s...
TRANSCRIPT
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