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Erosion and Deposition

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Presentation on theme: "Erosion and Deposition"— Presentation transcript:

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

6 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.

7 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

8 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

9 Landslide/Mudflow

10 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.

11 Creep

12 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?

13 Guided Practice Independent Practice
Page 55 # 1-4 Check with teacher for answers IP- Note Taking Guide Pg 56-57 # 1-21

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