(5) Debris avalanche: Rapid landslide of soil, rock, and organic debris along a shallow plane parallel to the slope, usually caused by protracted heavy rains that completely saturate the soil mantle.
(Rapid landslide of soil, rock, and organic debris along a shallow plane parallel to the slope; caused; by protracted heavy rains; T:usually) (protracted heavy rains; saturate; the soil mantle)
Rapid landslide of soil, rock, and organic debris along a shallow plane parallel to the slope protracted heavy rains
caused saturate
by protracted heavy rains T:usually
the soil mantle