Mudflows could very well be an agent of erosion. Their massive weight will move anything in their path. Rocks right up to boulders can be swept down in the rush of the material in response to gravity. And they can be extremely abrasive depending on the material suspended in them. It is the moving mass of mudflows that gives them the ability to "power through" anything that extends up even a fraction of an inch above "ground level" that makes them unstoppable. You've seen what water slamming into things does. Imagine "water" that has several times the mass of liquid H2O (which mud has) slamming into a bank of earth or into a pile of rocks. Goodbye earth or rocks.
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Yes.
Wind is an agent of erosion. It is responsible for moving material from one place to another place.
Waves
It's heavy, it moves, it grinds.
Water.