Question

Erosion and deposition occur side by side. Givereason

Answer 1

Answer:

It is because that is how it works. If you have a heavy rainstorm that starts to drop large amounts of rain on a field — you will likely see the results of erosion that occurs as the water moves soil from hilly areas to lower areas of the field. Any areas in the field that are flat, all of that water will just turn it into mud. The soil moving from that field is not traveling great distances away from where it was originally located. So, where the erosion occurred may be literally just a few meters from the spot where it was deposited.

A different scenario may be the type of erosion caused by wind — especially heavy winds. We see the most extreme examples of wind erosion when looking at dust storms. The soil particles that are lofted into the air could travel many miles before being deposited somewhere else. The wind erosion that occurs near where I live can easily be seen in the winter time. When we have a good layer of snow on the ground, then get some high winds from the west or northwest, a person can easily see the brown streaks of soil that collect in the snow drifts at the ends of the field. It is very rare to see any storm event in the Upper Mississippi River Valley that would be equated to a dust storm. When we suffer wind erosion here, it is likely that the soil is being deposited at the field edges or on the field or property next door.

Flooding has the ability to cause huge amounts of damage and erosion. In a flood event, where the water is moving at a sufficient speed to be able to carry a load with it as it flows, can move a lot of top soils over great distances. One only has to look at any of the river deltas that have been created on big rivers in order to view the process of deposition after erosion. A flood event may be a terrible tragedy for the local person who loses top soil; but, historically, flooding has been a very beneficial event in areas of the world where man's first civilizations developed. The Nile River and the Tigris and Euphrates, the flooding that happened along these rivers help to rejuvenate the soils along the river and created wonderful soils for growing the crops that were needed by these developing societies.

Yes, in many cases, you will find that the spot of soil deposition will not be very far from the location where the erosion occurred. However, one must remember that we, humans, tend to look at things from a view that encompasses only a few years, a decade, maybe one human lifetime. The earth operates on geological time. What appears to us as a somewhat minor event in our ‘short’ view will look completely different when considering the time spans involved in geologic time. We might lose a couple of inches of topsoil off of a field over a lifetime — that is tragic. In geologic time, great mountain ranges will be reduced to foot hills and a small meandering stream will turn into The Grand Canyon.

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