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Problems with Erosion.

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Presentation on theme: "Problems with Erosion."— Presentation transcript:

1 Problems with Erosion

2 MASS WASTING Landslides Mudslides/Mudflows Rockslides Creep Slump

3 Mass Wasting/Mass Movement The process by which soil and rock move down-slope.

4 Erosion; the process by which natural forces move weathered rock & soil from one place to another. Gravity

5 The material moved by erosion is called SEDIMENT.
This may include pieces of rock or soil.

6 Mass 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.

7 Landslides are the most destructive of the four types of mass movement
Landslides are the most destructive of the four types of mass movement. Landslides happen when rock & soil slides quickly down steep slopes.

8 This is a picture of a landslide. A type of mass wasting.

9 Landslide- Brazil

10 Landslide- Washington

11 Landslide - Brazil

12 Landslide - Dominica

13 Mudflows are very dangerous
Mudflows are very dangerous. Mudflows occur when water (as much as 60% of the flow), rock & soil moves rapidly downhill

14 Mudflow– Washington

15 Mudflow- Mexico

16 Mudflow - Seattle

17 Rockslide Rockslides are caused when rocks become loose and are pulled down by gravity. Rocks may become loose by the agents of erosion such as wind and water.

18 Rockslide- Brazil

19 Rockslide- Yosemite

20 Rockslide, Yosemite, California

21 Creep is very slow movement.
Creep is often barely noticeable, you may eventually see the effects of the slow movement in telephone poles, fence posts & trees leaning at odd angles

22 Creep- California

23 Creep

24 Creep

25 Creep

26 This is a diagram of creep
This is a diagram of creep. The hillside slowly slips over many years from water and gravity.

27 Slump occurs when one huge mass falls together.
Occurs when a mass of rock & soil suddenly slip down a slope in one huge mass Slump happened when water soaks the bottom of soil rich in clay

28 In this picture the land has slumped
into the road below.



31 Avalanche An avalanche is the same as a landslide but it is made of snow and ice.

32 This is a picture of an avalanche
This is a picture of an avalanche. It is similar to a landslide with ice and snow instead of rock.




36 Erosion Other problems associated with erosion; Sink holes Coastal Erosion

37 Cave Formation United Streaming Clip

38 Cave formation

39 Cave Features- Deposition
United Streaming - Deposition

40 Some unusual formations

41 As the slightly acidic rain water passes through rock, it dissolves away calcite and enlarges cave passages. Cave formations grow as the calcite is deposited.

42 Stalactites


44 Stalagmites

45 Stalagmites and stalactitesin Lechuguilla Cave, New Mexico, USA

46 gypsum stalactites

47 Witch’s Finger in Carlsbad Caverns


49 Bottlebrushes form when Stalagtites are in water for extended lengths of time.

50 Columns


52 Shields

53 Helictites


55 Rimstone Pools


57 Gypsum Flower


59 Selenite Needles


61 Cave Pearls


63 Popcorn


65 Fine Straw Formations

66 Potato Chip Formation

67 Water slowly seeps into limestone and drips

68 Flowstone indicates a steady source of water over a long time period.

69 Sinkholes Forms when limestone dissolves and the roof or top of the cave collapses.

70 Sink Hole- Guatemala

71 Sink Hole


73 Sink Hole

74 Sink Hole – Western KY


76 Sinkhole Guatemala


78 More sinkholes -8

79 Coastal Erosion- California

80 Coastal Erosion- Alabama



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