Transcript Problems with Erosion

 Landslides
 Mudslides/Mudflows
 Rockslides
 Creep
 Slump
SINKHOLES
COASTAL EROSION
Mass Wasting/Mass
Movement
The process by which
soil and rock move
down-slope.
Erosion;
the process by which
natural forces move
weathered rock & soil
from one place to another.
Gravity
The material moved by
erosion is called
SEDIMENT.
This may include pieces of
rock or soil.
Mass movement happens
when gravity moves
sediment downhill.
Mass movement can be
rapid or slow and is caused
by gravity.
Landslides are the most
destructive of the four
types of mass movement.
Landslides happen when
rock & soil slides quickly
down steep slopes.
This is a picture of a landslide.
A type of mass wasting.
Mudflows are very dangerous.
Mudflows occur when water
(as much as 60% of the
flow), rock & soil moves
rapidly downhill
 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.
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
This is a diagram of creep. The hillside
slowly slips over many years from water
and gravity.
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
In this picture the land has slumped
into the road below.
 An
avalanche is the same as
a landslide but it is made of
snow and ice.
This is a picture of an avalanche. It
is similar to a landslide with ice
and snow instead of rock.
Other problems associated with erosion;
Sink holes
Coastal Erosion

United Streaming Clip
http://www.uwec.edu/jolhm/cave2005/grou
p4/Cave%20Formation.htm

United Streaming - Deposition
Deposition
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.
Water slowly seeps into limestone and drips
Flowstone indicates a steady source of
water over a long time period.
 Forms
when limestone
dissolves and the roof or top
of the cave collapses.

http://www.youtube.com/watch?v=ll_hCCPu0
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