Transcript Erosion and Weathering Power Point

Weathering
Weathering
And
And
Erosion
Erosion
The Different Types of Weathering
Erosion occurs when rock is washed, blown, or
carried away
Weathering occurs when rock is broken down but
stays in one place.
The MAIN causes of erosion are;
•Running water
•Wind
•Waves
• Glaciers
Grand Canyon: Rock layers formed and then were worn
away by running water.
In this picture the running water eroded rock,
forming a canyon.
The ground has been washed away by water. That is erosion.
The water is creating
erosion. The water is
breaking up the soil and
carrying it away. What did
the power of running water
create in this picture?
Water erosion has taken this soil away and created
gullies.
These rocks have been blasted by wind
and sand causing them to become rounded.
WIND ABRASION
Over great time, weathering from wind and running
water caused these formations.
Arches National Park was created when softer rocks
weathered due to wind and rain and tough rocks on top were
left behind forming huge arches and pillars. The sediment or
rock bits we carried away leaving the empty space.
Wave Action ; when waves hit the rocks and
pieces of rock break off. This is what causes
shorelines to erode and creates beaches.
Weathering from waves
and tides made this
arch.
Can you make a
hypothesis about what
this coastline looked
like millions of years
ago? Can you predict
what this coastline will
look like in the future?
Why?
Weathering cause by tides and waves on the coast
line.
Erosion
The first five pictures of this presentation are of the same rock, just in different time
periods. Pay attention to the dates on the side of the pictures and see what the water
did to this rock.
1890
Erosion
Still the same rock.
1910
Erosion
Still the same rock.
1920
Erosion
Still the same rock.
1970
Erosion
Still the same rock, but where did it go?
1990
This glacier is
carving out a U
shaped valley
between these
mountains.
This is a picture of a glacier which carves
out a U-shaped valley where it flows
dragging rocks and boulders along the way.
•Oxidation
• Root Pry
• Exfoliation
• Frost Action
(Freeze and
Thaw)
•Wind abrasion
This rock is red because of the oxidation of
iron in the sediment when the rock was
being formed.
Plant Roots
Root Pry
This is a picture of
the Half Dome.
The rock is
peeling away from
the mountain in
layers just like an
onion. This is
exfoliation.
Dome Exfoliation
Freeze and Thaw
Frost Action or freeze and thaw slowly breaks up
this sedimentary rock into unusual shapes.
Weathering from wind, rain, and freeze and thaw made Bryce
Canyon.