When can primary succession occur?
a. after a glacier forms, a volcano erupts, or when a strip mine is productive
b. after a glacier receded, a volcano forms, or when a strip mine is abandoned
c. after a glacier recedes, a volcano erupts, or a strip mine is abandoned
d. after a glacier recedes, a volcano forms or a strip mine is productive

      The right answer to this question is option C. after a glacier recedes, a volcano erupts, or a strip mine is abandoned

Explanation:

      The reason for that is that a primary succession will occur when there are no human activity present, and on that way, nature can act and transform the place in a productive thing. For example, after a volcano erupts, there are no things alive on the surface anymore besides birds that will run away, and after some time, nature will absorve this energy and then a brand new ecosystem will be started at this point, and this can be called primary succession.

i think the miocene epoch spans the time from 23 million to 12 million years ago.

the  frequency of a wave represents  the number of wavelengths that pass a specific point per second. the unit for  frequency  is hertz (hz).

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pls mark as brainliest