Read the passage below: A volcano erupted along a mountain side. After the eruption, the ground was basically just rock. Lichens and mosses began to grow on the rock and began to
break down the rock to form soil. Small grasses begin to take root and start to grow also.
Smaller shrubs come next. Squirrels and rats moved in to dig holes in the soil which allowed
plants to grow. After several years, trees take root and grow where there once was only rock.
Why is this an example of Ecological Succession AND what type of succession is this (primary
or secondary)? Provide evidence to support your answer.