Exploring Natural Phenomena: Avalanche, Lahars, and Rock Avalanches
What type of natural event occurs when a slab of snow fails and detaches to start an avalanche?
A) Slab Avalanche B) Lahars C) Rock Avalanches D) Mudflows
Answer:
A) Slab Avalanche
When a slab of snow fails and detaches to start an avalanche, the correct term for this phenomenon is known as a slab avalanche. This occurs when a cohesive layer of snow slides over a weaker layer of snowpack, resulting in an avalanche. These avalanches can be triggered by various factors such as additional snowfall, disturbances, or the angle of the slope.
What term is used to describe mudflows due to rapid melting of snow packs along the sides of snow-covered mountains?
A) Lahars B) Rock Avalanches C) Avalanche D) Slab Avalanche
Answer:
A) Lahars
When rapid melting of snow packs along the sides of snow-covered mountains leads to mudflows, the correct term for this phenomenon is called lahars. Lahars are volcanic mudflows or debris flows that contain a mixture of pyroclastic material, rocky debris, and water. They flow down from volcanoes, typically following river valleys.
What type of event occurs when large masses of rock slide, break into many pieces, and move in a fluid manner supported by a cushion of air?
A) Slab Avalanche B) Lahars C) Rock Avalanches D) Mudflows
Answer:
C) Rock Avalanches
Rock avalanches occur when large masses of rock slide, break into numerous pieces, and move in a fluid manner. This movement is supported by a cushion of air, allowing the rocks to flow down slopes rapidly. Rock avalanches are natural events that can be triggered by various geological processes.