“By now it was dawn, but the light was still dim and faint. The buildings around us were already tottering. . . . This finally decided to leave the town. Once beyond the buildings, we stopped, and there we had some . . . experiences that thoroughly alarmed us. The carriages . . . began to run in different directions through the ground was quite level. . . . We also saw the sea sucked away and forced back by the earthquake: at any rate, it receded from the shore so that quantities of sea creatures were left stranded on dry sand. On the landward side, a fearful black cloud was rent by forked and quivering bursts of flame, and parted to reveal great tongues of fire, like flashes of lightning magnified in size.”
—Pliny the Younger, as quoted in Eyewitness to History

This passage is about a volcano, but much of the description in the passage is about?
A. burning buildings.
B. sea creatures.
C. carriages.
D. earthquakes.