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