A company called Sierra Pacific Industries is destroying forests by a destructive and non-sustainable practice called clearcutting. This is being done at an alarming rate in specific counties in California. A. Primary Succession
B. Secondary Succession​

Secondary succession.

Explanation:

Clearcutting leaves an area barren. It is a  horrible practice and is opposed by every environmental group. There are better ways of logging without destroying the plant life present there.  This is secondary succession because plant life did exist in the area that clear cut and will again if the logging company or the government will replant the area.

layer 3 is younger than layer 6.