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3-1 Mass Movement When slopes fail…. REVIEW Once weathering has occurred, then erosion can take place. What is EROSION?. EROSION is the process of carrying away weathered rock. The Grand Canyon is an example of what erosion can do!.

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Presentation Transcript
slide1

3-1

Mass Movement

When slopes fail…

slide2

REVIEW

Once weathering has occurred, then erosion can take place.

What is EROSION?

slide3

EROSION is the process of carrying away weathered rock.

The Grand Canyon is an example of what erosion can do!

slide4

Eventually most of the broken bits of rock end up in streams & rivers that flow down from the mountains. These little bits of rock & sand are called SEDIMENTS.

slide5

What is DEPOSITION?

DEPOSITION is the process of laying down weathered rocks in a new location.

slide6

Weathering, sediments, erosion and deposition work together in a cycle!

Weathering

Sediments

Deposition

Erosion

slide7

What is

Mass Movement?

Erosion & deposition of large amounts of sediment downhill, sediment is usually loose

slide8

How does

Mass Movement work?

By the force of gravity

Can be fast or slow

slide9

Landslide

La Conchita, CA 1995

slide10

Landslide

Close-up

La Conchita, CA 1995

slide11

Landslide

Looking down

La Conchita, CA 2005

slide14

Before

Landslide

Peru's Main Plaza Landslide's Destruction

After

1 landslide very fast
1. LANDSLIDE (very fast)

Happens when rock and soil break loose from steep slopes

  • most destructive mass movement
  • falls quickly to the bottom
  • occur in mountainous areas
  • may contain huge masses of rock
2 mudslide mudflow very fast
2. MUDSLIDE/MUDFLOW (very fast)

A thick mixture of sediments and

water flow down a slope

  • occur in dry areas where weathering forms thick layers of dry sediment
  • heavy rains mix with sediment to make mud
  • have enough energy to move anything in its path
  • at the bottom of slope, loses its energy of motion deposits all the sediments and debris it has been carrying
3 slump fast
3. SLUMP (fast)

Occurs when loose material or rock layers slip downward as one large mass

  • takes place as one large mass
  • doesn't move materials very fast or very far
  • curved scar is left where slumped material was
  • occur because the clay under the slumped material weakens because it gets very wet
  • when it can no longer support overlying material it slips downhill
slide33

Creep

http://www.physicalgeography.net/fundamentals/10x.html

4 creep very slow
4. CREEP (very slow)

Gets its name from the way sediments slowly creep down a hill

  • especially common in areas where freezing and thawing occur (ice wedging)
  • as the ground freezes, small sediments are pushed up by expanding water in the soil
  • when the soil thaws, the sediments fall downhill
  • trees, utility poles and fence posts lean or slant downhill