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A mass of falling and tumbling rock, debris, and soil traveling at a high velocity owing to the presence of ice or water is a _____ rockfall. mudflow. debris avalanche. landslide.

User Bluefire
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Due to the fact that you said ice or water I'm thinking a mudflow but it could be a landslide considering the rock and debris but I'm almost certain its a mudflow because mudflows happen at high velocities, or quickly than all the other options you have there.
User Matt Woelk
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