1. Earth History Concept 1: Forces that Shape the Earth

2. Essential Questions How do weathering, erosion and deposition change the surface over time? How do weathering, erosion and deposition change the surface over time? What specific forces cause weathering, erosion, and deposition of Rock Material? What specific forces cause weathering, erosion, and deposition of Rock Material?

3. Vocabulary Words Weathering : The natural breakdown of solid rock into smaller fragments through chemical, physical and biological processes. Weathering : The natural breakdown of solid rock into smaller fragments through chemical, physical and biological processes. Physical weathering a form of weathering characterized by the mechanical (disintegration) break down of rock into smaller fragments but not involving chemical change Physical weathering a form of weathering characterized by the mechanical (disintegration) break down of rock into smaller fragments but not involving chemical change

4. Vocabulary cont Frost wedging: a form of physical weathering caused by cycles of freezing and thawing of water in pores or cracks of rocks Frost wedging: a form of physical weathering caused by cycles of freezing and thawing of water in pores or cracks of rocks Chemical weathering: a form of weathering involving chemical change that decomposes rocks and produces new substances Chemical weathering: a form of weathering involving chemical change that decomposes rocks and produces new substances

5. Vocabulary continued.. Oxidation: a form of chemical weathering in which certain minerals combine with oxygen to produce new minerals Oxidation: a form of chemical weathering in which certain minerals combine with oxygen to produce new minerals Solution weathering: a form of chemical weathering in which rocks such as limestone is dissolved by natural acids, such as carbonic acid Solution weathering: a form of chemical weathering in which rocks such as limestone is dissolved by natural acids, such as carbonic acid

6. Homework Provide a picture example of each type of weathering: Provide a picture example of each type of weathering: a.) Frost wedging a.) Frost wedging b.) Chemical weathering b.) Chemical weathering C.) solution weathering C.) solution weathering d.) oxidation d.) oxidation

7. What is the difference between weathering and erosion? Once the small pieces of rocks are changed or broken apart by weathering Once the small pieces of rocks are changed or broken apart by weathering They may start to be moved by wind, water, or ice. When the They may start to be moved by wind, water, or ice. When the smaller rock pieces (now pebbles, sand or soil) are moved by these natural smaller rock pieces (now pebbles, sand or soil) are moved by these natural forces, it is called erosion. forces, it is called erosion.

8. Weathering and Erosion So, if a rock is changed or broken but stays where it is, it is called Weathering So, if a rock is changed or broken but stays where it is, it is called Weathering If the pieces of weathered rock are moved away, it is called Erosion If the pieces of weathered rock are moved away, it is called Erosion

9. Weathering or Erosion

10. Erosion can be caused by: Rain Rain Hail Hail Snow Snow Wind Wind

11. Homework: Complete the concept map on Weathering and Erosion Complete the concept map on Weathering and Erosion And play the Weathering and Erosion game at: And play the Weathering and Erosion game at: http://schoolmediainteractive.com/view/obj ect/interactive/6EF46CAA2D38E0EABB11A57 BAFFB1753/099459804A638DAB6873167F7B 90E2F4 http://schoolmediainteractive.com/view/obj ect/interactive/6EF46CAA2D38E0EABB11A57 BAFFB1753/099459804A638DAB6873167F7B 90E2F4