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Mass Movement: What causes the different types of mass movement?

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Presentation on theme: "Mass Movement: What causes the different types of mass movement?"— Presentation transcript:

1 Mass Movement: What causes the different types of mass movement?

2 Erosion is the process by which natural forces move weathered rock & soil from one place to another.

3 What is the material moved by erosion called? sediment This may include pieces of rock or soil or the remains of plants or animals

4 Deposition happens where agents of erosion drop or lay down sediment. (The word ‘agents’ means the processes or ways that erosion occurs.)

5 Mass movement happens when gravity moves sediment downhill. Mass movement can be rapid or slow and is caused by gravity.

6 Landslides are the most destructive of the four types of mass movement. Describe: Rock & soil slides quickly down steep slopes Where does it happen? Where road builders cut through hills or mountains

7 Landslides h ttp://carletong.wordpress.com/2009/04/27/paybacksamother/

8 Mudflows are very dangerous. Describe: Water (as much as 60% of the flow), rock & soil moves rapidly downhill What may trigger it? Earthquake moveme nt

9 Mudflows

10 Slump occurs when one huge mass falls together. Describe: Mass of rock & soil suddenly slip down a slope in one huge mass What makes it happen? When water soaks the bottom of soil rich in clay

11 Slump Cartersville, Georgia

12 Creep is very slow movement. Describe: Barely noticeable, you eventually see the effects of the slow movement in telephone poles, fence posts & trees leaning at odd angles What causes creep? From freezing & thawing of H2O in cracked layers of rock beneath the soil

13 Creep geology/geo101/masswasting.html&usg=__NXT2vQd6NNlaYppssy5JkhmQtO8=&h=357&w=300&sz=33&hl=en&start=7&um=1&tbnid=T5WrN7Z S1oqFeM:&tbnh=121&tbnw=102&prev=/images%3Fq%3Dcreep%2Bmass%2Bmovement%26hl%3Den%26sa%3DN%26um%3D1 Bent tree trunk illustrating creep. National Zoo, Rock Creek Park, Washington, D.C.


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