2. Does a rock remain the same forever? No, rock changes from one rock type to another. Weathering Erosion Heat Pressure What are some of the forces that change rocks?

3. Weathering Weathering – the process of breaking rock into silt, sand, clay, and other tiny pieces, called sediment. Agents of weathering – wind, water, and ice.

4. Two types of weathering 1.Physical weathering – changes the size and shape of rocks.

5. Examples of Physical Weathering In cold temperatures, water freezes and expands. This creates forces that can crack rock and pavement. Ground water is precipitation that soaks into the ground and soften the mountains. Run-off is precipitation that does not soak into the ground, but runs across the ground. This causes weathering of soil and rocks.

6. Chemical Weathering 2. Chemical weathering – a process that changes minerals in rocks. Crystal Ball Cave, Utah. Features hanging down from the ceiling are stalactites. Pillar-like features on the cave floor are stalagmites. Both stalagmites and stalactites are formed from the precipitation of limestone within the cave. Image courtesy of Dr. Ira Sasowsky.

7. Erosion Erosion – the process of moving sediments from one place to another. Agents for erosion – Water, Wind, and Ice.

8. The Rock Cycle

9. Click on the link below and learn more about the rock cycle. 1.Play the movie. 2.Follow the directions given in the website. http://www.classzone.com/books/earth_science/terc/content/investigations/es0602/es060 2page02.cfm

10. Visit the Following Websites http://duedall.fit.edu/wholeearth/geology_ani mations1.htm http://walrus.wr.usgs.gov/seds/bedforms/ani mation.html

11. Bibliography http://www.uh.edu/~jbutler/physical/chapter6.html http://3dparks.wr.usgs.gov/2005/naturalbridges/html/nb1 64.htmhttp://3dparks.wr.usgs.gov/2005/naturalbridges/html/nb1 64.htm http://pinker.wjh.harvard.edu/photos/new_zealand_II/ima ges/Black%20Rocks%2004.jpghttp://pinker.wjh.harvard.edu/photos/new_zealand_II/ima ges/Black%20Rocks%2004.jpg http://www.cartage.org.lb/en/themes/sciences/earthscien ce/geology/soils/FormationSoils/WeatheringSoils/Chemi calWeathering/chemicalweathering.htmhttp://www.cartage.org.lb/en/themes/sciences/earthscien ce/geology/soils/FormationSoils/WeatheringSoils/Chemi calWeathering/chemicalweathering.htm http://earthnet- geonet.ca/glossary/display_term_e.php?term=erosionhttp://earthnet- geonet.ca/glossary/display_term_e.php?term=erosion http://www.teachnet- lab.org/ps101/bglasgold/rocks/lesson3rockcycle.htmhttp://www.teachnet- lab.org/ps101/bglasgold/rocks/lesson3rockcycle.htm