Final answer:
Mountainside communities often have plans in place to keep people safe during a natural disaster. The order of mass movements based on reaction time is creep, earthflow, avalanche, and none of the above.
Step-by-step explanation:
Mountainside communities often have plans in place to keep people safe during a natural disaster. The ordering of mass movements based on the amount of reaction time for community members to get to safety is as follows:
- Creep: Creep is a slow, gradual movement of soil and rock down a slope. It is the slowest mass movement and gives the most reaction time for people to evacuate.
- Earthflow: Earthflow is a type of mass movement where saturated soil slowly flows downhill. It is slower than an avalanche but faster than creep, providing some reaction time for evacuation.
- Avalanche: An avalanche is a rapid downhill movement of snow, ice, and debris. It occurs suddenly, giving the least reaction time for evacuation.
- None of the above: This option indicates that none of the listed mass movements are applicable to the given scenario of mountainside communities.