Presentation on theme: "Mass Movement: What causes the different types of mass movement?"— Presentation transcript:
1Mass Movement: What causes the different types of mass movement?
2Erosion isthe process by which natural forces move weathered rock & soil from one place to another.
3What is the material moved by erosion called? sediment This may include pieces of rock or soil or the remains of plants or animals
4Deposition happens where agents of erosion drop or lay down sediment Deposition happens where agents of erosion drop or lay down sediment. (The word ‘agents’ means the processes or ways that erosion occurs.)
5Mass movement happens when gravity moves sediment downhill Mass movement happens when gravity moves sediment downhill. Mass movement can be rapid or slow and is caused by gravity.
6Landslides are the most destructive of the four types of mass movement. Describe:Rock & soil slides quickly down steep slopesWhere does it happen?Where road builders cut through hills or mountains
12Creep 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 anglesWhat causes creep?From freezing & thawing of H2O in cracked layers of rock beneath the soil
13CreepBent tree trunk illustrating creep. National Zoo, Rock Creek Park, Washington, D.C.