Weathering and Erosion Snapshot
Published on Nov 18, 2015
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PRESENTATION OUTLINE
Erosion Definition:
The process by which natural forces move weathered particles of rock and soil
Photo by Rudolf Getel
Erosion by Gravity:
This hill is an example of erosion by gravity. The sediments that were on the hill were pulled down by the forces of gravity. Commonly, sediments are pulled down a hillside or steep surface.
Photo by subarcticmike
Erosion When Vegetation is Removed From A Hillside:
This hill is an example of erosion when vegetation is removed from a hillside. These trees were removed from the hill and now dirt and soil are free to fall because of gravity.
Erosion in Minnesota:
Minnehaha Falls is a form of erosion in Minnesota. Waterfalls carry sediments from rivers in them off a cliff and into different streams.
Photo by Chuckumentary
The river in the Grand Canyon is an example of moving water erosion because it is a water stream that picks up sediments like pebbles them and carries them elsewhere
Photo by Wolfgang Staudt
This arch is an example of wind erosion because over millions of years the wind has broken down the rock that used to be surrounding the arch. The arch will most likely continue to erode.
Photo by minnepixel
An example of erosion from glaciers can be found at Yosemite National Park. Thousands of years ago the glaciers sheared away at the mountainside and took sediments along with them.
Physical Weathering:
Weathering of rocks, minerals, soil, or other materials through contact with natural sources.
Photo by loop_oh
One example of physical weathering is desert arches. These used to be large masses of rock but through the years wind has eroded them to form arches.
Photo by Alan Vernon.
Another example of physical weathering is rocks with small crevices in them. A lot of the time these crevices are formed when water repeatedly freezes inside the cracks when it is cold and then thaws in them when it is warmer. If this happens repetitively it causes large cracks.
Photo by Ken Lund
Chemical Weathering:
The changing of a rock or mineral into another substance (compounds).
Photo by j_arred
Rust is another form of chemical weathering. This is so because when metals like iron or aluminum match with water and air, a material called rust starts to form on it. This changes the properties of the substance.
Photo by Bev Goodwin
A second example of chemical weathering is oxidation. Oxidation is when oxygen combines with the minerals of a substance. This changes the substance to another one.
An example of weathering in Minnesota is Mystery Cave. Mystery Cave is an example of weathering because it is a cave and all caves are formed from mechanical weathering.
THE END!
Photo by Don J Schulte
