Flexi Says: Primary succession occurs in an area that has never before been colonized. Generally, the area is nothing but bare rock. This type of environment may come about when lava flows from a volcano and hardens into rock, when a glacier retreats and leaves behind bare rock, or when a landslide uncovers an area of bare rock. Secondary succession occurs in a formerly inhabited area that was disturbed. The disturbance could be a fire, flood, or human action such as farming.
