1. Weathering The process of breaking down of rocks into smaller and smaller pieces of rock. These small pieces are known as sediment. Sediment breaks down further and becomes soil. YehliuTaiwan-HoneycombWeathering 180px-GeologicalExfoliationOfGraniteRock

2.  Mechanical/ Physical Weathering  Chemical Weathering Types of Weathering

3.  Ice Wedging- Water in the cracks of rocks freeze  Abrasion- Particles of sand are carried by the wind and water  Plant Action – roots from plants grow in the cracks of rocks  Release pressure – when pressure is removed from rocks Types of Mechanical Weathering

4. Chemical Weathering The process in which the chemical makeup of a rock is changed by a chemical reaction. http://en.wikipedia.org/wiki/Weathering#Chemical_weathering

5. Types of Chemical Weathering  Oxidation – a chemical change that occurs when oxygen and iron form.  Acids – natural acids break down rock. http://en.wikipedia.org/wiki/Stalagmite

6. Erosion  Erosion takes rocks and other particles from one location and puts them in another.  Weathering is breaking up rocks erosion is carrying them away.

7. The Agents of Erosion  Wind  Water  Glaciers  Gravity / Mass Movement

8. Wind Erosion  Wind can carry sand, silt, and clay from one place and deposit it in another.  This type of erosion is most frequent in dry areas with little or no vegetation.

9. Wind Erosion http://upload.wikimedia.org/wikipedia/en/1/15/Mesquite_Sand_Dunes.JPG

10. Water Erosion  The most important agent of erosion is running water.  Water runs down hill and form a gully by taking away sediment.  Water continues to flow in the gully and eventually forming a valley.  Water can cause erosion of the shore line can be from waves in the ocean.

11. Water Erosion http://en.wikipedia.org/wiki/Image:Gully_ElPasoCounty_CO_USA.jpg

12. Water Erosion http://en.wikipedia.org/wiki/Image:Wavecut_platform_southerndown_pano.jpg

13. Glaciers Erosion  Glacier Erosion is sometimes referred to as Ice Erosion  Glaciers move slowly across land picking up large rocks and even larger boulders.  Glaciers can cause deep valleys to form as they move across the land.

14. Glaciers Erosion http://en.wikipedia.org/wiki/Image:Glacier_mouth.jpg

15. Gravity/Mass Movement Erosion  Gravity is the force behind Water and Glacier Erosion  Gravity alone can cause Erosion

16. Gravity/Mass Movement Erosion http://en.wikipedia.org/wiki/Erosion#Gravity_erosion

17.  Slump  Creep  Rockfalls  Rockslides  Mudflows  Landslides Types of Gravity/Mass Movement Erosion

18. Slump http://geology.about.com/library/bl/images/blslump.htm  A slump occurs when a mass of land slips and moves down a slope.  A slump occurs when the slope becomes too steep and the material under it can not support the ground above it.

19. Creep  Sediment slowly moves down hill.  Leaning trees and fence post are clues that creeping is occurring

20. Rockfalls Occur when parts of a rock break off a tumble through the air. http://www.seismo.ethz.ch/hazard/risk/PaleoSeis/rockfalls2.htm

21. Rockslides http://www.grisda.org/origins/11090.htm  Large and small rock slide down a slope.

22. Mudflows http://en.wikipedia.org/wiki/Image:Mudflow_mailboxes.jpg  Happen after heavy rains.  More likely to occur when there is a lack of vegetation.  Gravity pulls on the heavy water saturated sediment and causes it to flow down hill.

23. Landslides http://www.signonsandiego.com/news/state/20050601-1811-wst-lagunalandslide.html  A movement of land down a slope.

24. Deposition http://education.usgs.gov/lessons/schoolyard/RockSedimentary.html  Process by which sediments, soil and rocks are added to a landform or land mass (the end of erosion).