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The correct word is indeed landslide. You could say landslides are one of many forms of erosion. There are other forms of erosion besides landslides, so calling it erosion instead, while not incorrect, is less descriptive.
Originally posted by ShadowLink
Correct me if I am wrong, but wouldn't the term be Erosion? Since it is water from a creek or river Eroding the land, just a guess.