Assertion: icefall avalanche | /r/AtLocation | ravine
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Source sentences:
text: Three types of avalanches may be distinguished, depending on the nature of snow movement along the slopes: osovy (snowslide) avalanches, which slide along the entire surface of the slope without channels; chute avalanches, which move in hollows, ravines, and eroded furrows; and leaping avalanches, which fall freely from ledges.