Final answer:
A mudflow is not a slope collapse with backward rotation; it's a fast-moving landslide caused by water-saturated soil and debris moving downhill, while a slope collapse with backward rotation refers to a rotational slide or slump.
Step-by-step explanation:
The statement that a mudflow is a slope collapse with a backward rotation is False. A mudflow is actually a fast-moving type of landslide that occurs when slope material such as soil, rock, and vegetation become saturated with water, creating a slurry that can flow downhill at great speeds. These flows can gather debris like trees, cars, and even parts of buildings, posing significant risks to areas in their paths. The term 'slope collapse with a backward rotation' typically describes a rotational slide or slump, which is a different type of landslide characterized by a rotational movement. Therefore, mudflows and rotational slides are distinct phenomena within the broader category of landslides.