Question

heavy rainfall in a mountainous region caused a landslide that removed all the soil and organisms that inhabit the area. which of the following best describes the type of succession?
this is secondary succession because it occurred in an established ecosystem.
this is primary succession because it would take a very long time for new organisms to move in.
this is primary succession because it is occurring in an area with bare rock
this is secondary succession because the climax community can start growing

Explanation:

Primary succession occurs in an area where there is no soil and no existing organisms, like after a landslide that removes all soil and organisms leaving bare rock. Secondary succession occurs in an area where soil is still present and there was a previously established ecosystem. In this case, with all soil and organisms removed, it's primary succession.

Answer:

This is primary succession because it is occurring in an area with bare rock.