Creating and destroying land

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Presentation transcript:

Creating and destroying land Changing the way Earth’s surface looks Creating and destroying land

3 forces work together to change the way the Earth looks over long periods of time Weathering- breaks down earth Erosion-moves earth Deposition-builds up new land

Weathering

Weathering is the process of breaking rock material down into smaller pieces http://www.kidsgeo.com/images/mechanical-weathering.jpg

There are 2 types of weathering Mechanical Physically changes the rock Simply breaking the rock into smaller pieces caused by: Freezing and thawing Gravity Plant roots Abrasion (Being beaten up by other rocks in the water or wind) http://2.bp.blogspot.com/_L2UB67zlmHw/ST_TZVJrBAI/AAAAAAAAAM4/J-B_JnlXDMQ/s400/split+rock.jpg http://i.pbase.com/o6/43/815143/1/95073988.vBqLR03n.mechanicalweathering.jpg

caused by: Acid precipitation Weak acids found in plants Air pollution Chemical Chemically changes the rock making it easier to break Makes the rock soft and holey caused by: Acid precipitation Weak acids found in plants Air pollution http://www.geography4kids.com/files/art/land_weath3_240.jpg http://www.ux1.eiu.edu/~cfjps/1300/pits.jpg

Both types of weathering can happen at the same time on the same rock http://video.ecb.org/badger/download/vlc/images/VLC161_Water_and_weathering.jpg http://edu.glogster.com/media/3/8/83/68/8836818.jpg http://teacher2.smithtown.k12.ny.us/sgessler/weathering_files/image002.jpg

How fast weathering happens depends on: Kind of rock Hardness of rock (harder rocks weather slower) Climate and temperature (chemical is slower in cooler temps) Size and shape of the rock (larger rocks weather slower) Elevation This is called differential weathering