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Degradation, or decomposition of a surface, usually over an extended period of time.
There is no such thing as persitication
There are four main categories of contamination. The four main types are water, dilute acids, dilute bases, and organic solvents.
* cardinal * human * natural * moral
eroison agents i think are wind water gravity
Well it was formed by the Colorado River. Which is Water Eroison.
Weathering is the Break down of the rocks and Eroison is the movement of weathered rock material from one place to another.
water,wind,runing water,and waves
plants prevents soil eroison
cause there is to much soil on the earth so there is eroison