The tragedy in 1970 at yungay, peru a. occurred during the day, so many people were out of town and loss of life was low (< 200 people). b. started with an earthquake that triggered an icefall that in turn triggered a debris flow. c. is not considered mass wasting because it happened quickly, and, by definition, mass wasting is slow movement of material downslope. d. could happen again, unfortunately; the government rebuilt the town in the same place.

During May 1970 tragedy happened in Yungay, Peru is an undersea earthquake that triggered a catastrophic snow slips recorded in history that wipes out the entire mountainous land town of Yungay and its 25,000 residents. The quake damaged the river of ice formed by the accumulation and compaction of snow on mountains or near the poles which caused the 10 million cubic meters of rock, snow, and ice to break away and destruct its slope. Many of the inhabitants were buried and crushed by the landslide. The reported death were 74,000 and 25,600 were declared missing.