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Erosion and Deposition

Erosion and deposition, two actions that shape the world. Without them, earth’s

landscaping would be similar to mars. Erosion is often confused with weathering, people

believe that erosion is the act of breaking down sediments when in fact it is a mode of

transportation for these broken down sediments. Such modes of transportation are;

running water, glacial movement, and wind. Erosion by definition is, the process by which

earth materials are moved by natural agents like moving water, wind and ice. Deposition is

the depositing of theses sediments in certain areas. for example wind deposits sand on any

object where it continues to be deposited and forms a sand dune a large deposit if sand.

erosion and deposition happens in many ways in forms and in many places.

Running water is the most effective agent of erosion on the earth. running water

includes all water that falls on earth and moves down hill under the pull of gravity, be it

rain, snow or any other form of precipitation. like other agents of erosion, waters energy

comes from the sun. The sun lifts water by evaporation and eventually it is redeposited all

over the world. A key word to running water is carrying power. the carrying power of

. . .

Long island is one big terminal moriane and outwash from the glacier can be found south

of it. A river will roar straight

down a mountain carrying anything in its path because the mountain is on a slope, the

steeper the slope the greater the speed.

Eventually the glaciers will drop the boulders and they will remain there like solitary lost

giants. Over time the river deposits enough sediments to

completely separate the meander which forms an oxbow lake (“b” in diagram).

Continental glaciers are be born in polar regions of high altitude, almost any area that is

always constantly covered in snow. when regular sand is being deposited a nice rounded dune

is formed, but when loess or angular silt particles is being deposited the slipface will have

more of a stright drop to it. a big part of shaping this planet came from when the glaciers melted. Until the 1800’s geologist believed all the sediments deposited out of place all

over the country were transported there by a large flood, they even used this theory to

explain large boulders (sometimes the size of a house not at all rounded as they would be

if they were in a river) deposited right in the middle of a field or an area whose bedrock

was not at all similar to the composition of the boulder.

Winds are a powerful agent of erosion and a good example of deposition. The greater the slope of the bed of

a stream, the greater the velocity (or speed) the water will have, then the greater the

carrying power and in turn the greater the erosion. the bottom layers of ice begin to flow

downward or outward, (depending on the area) because of the pressure of overlying

snow and firn. as a glacier

moves it carries drift two types of it, out wash and till. some other key words are, slope, and velocity. All that running water is very impressive, but the most

impressive are the “mountain movers”.

Approximate Word count = 1283
Approximate Pages = 5 (250 words per page double spaced)

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