6. A volcanic eruption covers a wide area of forest
with ash, lava, and volcanic rock. Which of these
describes the first stage of ecological succession that
will begin to return biotic factors back to the forest
community and return it to a state of equilibrium?
A. The volcano stops erupting.
B. The lava cools to form rock.
C. Lichens grow on the rocks.
D. The rocks melt back into lava.