Erosion ppt presentation geology (1).ppt

Erosion

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PLAN
What is
Erosion?
Weathering vs.
Erosion
Wind Erosion
Water Erosion
Ice Erosion
Gravity Erosion
Conclusion

3. What is Erosion?
Erosion moving of rock material from
one place to a new location
Erosion is defined as removal of
rocks and soil by wind, water, ice and
gravity.
Wind, water, ice and gravity are also
known as the agents of erosion.
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4. Weathering vs. Erosion
Weathering involves two processes
[physical, chemical]
that often work together to break down
rocks. Both processes occur in place.
No movement is involved in
weathering.
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WhatIs Wind Erosion?
Wind –sediments that have been transported
by wind appear pitted (holes) and frosted
(glazed)
Effective in moving small, loose material
Occurs in areas where there is not enough
rainfall to support vegetation
Main effects:
1. Wind causes small particles to be lifted
and moved away.
2. Suspended particles may impact on solid
objects causing erosion by abrasion (rubbing)

6. Wind can play a role by carrying material
(especially sand and clay) from one place
to another.
As the wind blows, it picks up small
particles of sand/sediment and blasts large
rocks with the sand/sediment, cutting and
shaping the rock.
The intensity of wind erosion is
determined by:
Sum (amount of sand)
Speed
Slope
Surface
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WhatIs Wind Erosion?

7. Wind Erosion
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8. What is Water Erosion
When rain falls to the Earth it can evaporate, sink into the ground,
or flow over the land as Runoff. When it flows over land, erosion
occurs. Runoff picks up pieces of rock and "runs" downhill cutting
tiny grooves (called rills) into the land.
How much erosion takes place is determined by the:
Sum (amount of water)
Slope
Speed
Surface
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Flowing Water –sediments transported by water
appear rounded and smooth
–Most influential force in erosion
–Transports large objects with fast moving streams
–Helps create landforms:
• rivers
• lakes
• oceans
What is Water Erosion

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What is Water Erosion

11. Ice Erosion
Glaciers wear down the landscape; by
picking up and carrying debris that moves
across the land along with the ice.
Glaciers can pick up and carry sediment
that ranges in size from sand grains to
boulders bigger than houses.
Moving like a conveyor belt or a bulldozer,
a single glacier can move millions of tons
of material!
How much erosion takes place is
determined by the:
**Sum (Glaciers are massive!)
Slope
Speed
Surface
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12. Ice Erosion
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13. Gravity Erosion
Gravity Erosion is better known as
Mass Movement and is defined as the
transfer of rock and soil downslope
by direct action of gravity without a
flowing medium (such as water or
ice). Some of the best examples of
Mass Movement are:
Creep Rock fall Slump
Landslides
Avalanches
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14. Gravity Erosion
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15. Karst
A type of landscape where caves are
common.
The land has different sized blocks of
limestone. These fractures are where the
water seeps in, dissolves the stone, and
forms caves.
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CONCLUSION
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17. Sources
www.augusta.k12.va.us/.../lib/.../Weathering_a
nd_Erosion.ppt
www.powayusd.com/.../Erosion/The%20Force
s%20of%20Weathering%20and%20 Erosion.p
pt
mail.clevelandcountyschools.org/.../Weatherin
g_and_Erosion.ppt
Bryce Shelly; LehiJunior High School
6/3/2024
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