1. Erosion and Deposition Chapter 3 Section 1

2. Standard  S 6.2 Topography is reshaped by the weathering of roc and soil and by the transportation and deposition of sediment.

3. Anticipatory Set  Gravity affecting materials  Small board on desk, roll marble down, observe what happens  Small board on desk, roll block down, observe what happens  Put sandpaper on board, roll marble down, observe what happens  Put sandpaper on board, roll block down observe what happens  How were they different?

4. Vocabulary  Erosion- process of natural forces such as water, wind, ice or gravity that weathers a rock and moves it from one place to another.  Sediment- small, solid particles from weathered rocks  Deposition-laying down sediment in new places  Gravity- a force that moves weathered rocks downhill  Mass movement- any one of the several processes that moves rocks downhill

5. Input  Mudslide is a good example of erosion  It carries soil and gravel downhill after a rain  Gravity, water, glaciers, waves and winds all cause erosion.  The material that is moved by erosion is called sediment.  Sediment: rock, soil, plants and animal remains

7. Input  Deposition- where the agents of erosion deposit or lay down sediment.  It changes the land form  This cycle has been occurring for thousands of years  Weathering, erosion, and deposition act together to wear down and build up Earth’s surface.

8. Mass Movement Input  If you were on the top of a hill, sitting on a bike, what is the name of the term that pushes you down the hill without pedaling?  Gravity  Gravity causes mass movement  Different types of mass movement  Landslides  Mudflows  Slum  Creep

9. Input  Landslide- occurs when rock and soil slide rapidly down a steep slope.  They occur where road builders have cut highways through highways and mountains.  Mudflows- a rapid downhill movement of a mixtures of water, soil, and rock. The amount of water in a mudflow is higher than a landslide.  An earthquake can trigger mudflows and landslides

10. Landslide/Mudflow

11. Input  Slump- a mass of rock and soil rapidly slips down a slope.  It moves down in 1 large mass  Occurs when water soaks the bottom of soil that is rich in clay  Creep- very SLOW downhill movement of rock and soil. Result from freezing and thawing of water in cracks under the soil.  Creep may tilt objects at spooky angles.

12. Creep

13. Checking for Understanding  What is sediment?  What are the four types of mass movement?  What is mass movement caused by?  What is the difference between a slump and a landslide?

14. Guided Practice Independent Practice  Page 52  # 1-4  Check with teacher for answers  IP-  Note Taking Guide Pg 56-57  # 1-21