Which of the following are recognized categories of erosion?

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Erosion caused by raindrop impact and surface runoffErosion forming small channels and deep gulliesNatural (geological) erosion and human-induced accelerated erosionAll the above typesNone of the above

Explanation

Erosion can be classified into several types: rain splash and sheet erosion, rill and gully erosion, as well as normal (geological) erosion and accelerated erosion caused by human activities. Therefore, all these categories are valid types of erosion.