Weathering, Erosion and Deposition Chapter 10.4

Weathering The process of breaking down rock into smaller fragments Physical Weathering – broken by physical means Chemical weathering – chemical reactions cause rocks to breakdown Biological Weathering – caused by a plant or animal

Physical Weathering http://www.uky.edu/AS/Geology/howell/goodies/elearning/module07swf.swf

Chemical Weathering

Erosion Once rock has been broken into fragments, it gets carried away. Wind, water, glaciers, and gravity are the main transporters.

Deposition After rocks are picked up and moved, they also get placed down. http://www.classzone.com/books/earth_science/terc/content/visualizations/es0604/es0604page01.cfm?chapter_no=visualization http://faculty.gg.uwyo.edu/heller/SedMovs/loup_river.htm

Chemical Weathering causes caves Carbon dioxide in the air combines with rainwater to make carbonic acid This acidic rain falls on the ground It can react with limestone or marble underground The rock disappears and caves form. GOOD LINK!!! http://www.classzone.com/books/earth_science/terc/content/visualizations/es1405/es1405page01.cfm?chapter_no=visualization

Karst Topography When a large cave is close to the surface a sinkhole can result! An area with many sinkholes is called karst.

Homework!! Read Chapter 10.4 Work through section 10.4 in your workbook