In coastal areas, wind moves sand, blowing away or engulfing the soil, and eventually creating sand dunes:
In coastal areas, wind moves sand, blowing away or engulfing the soil, and eventually creating sand dunes::primary succession
The introduction of livestock to an area leads to over-grazing that removes native grasses::secondary succession
A forest is cleared to gather lumber used for building houses::primary succession
A lava flow down the side of a volcano destroys all vegetation and eventually turns into volcanic rock when it cools and hardens::primary succession