Many buildings in the city are built out of volcanic rock from the local area.

The floor seemed to have the texture and give of the volcanic rock.

This very old building was constructed on a hill of volcanic rock.

Because of the volcanic rock, the soil is relatively rich in some areas.

Volcanic rocks at about the same level have been dated to 76.9 1.2 million years ago.

The volcanic rock we found while digging in the backyard.

At first it found only volcanic rocks on the crater floor.

The dark volcanic rocks were piled up to clear the ground and make walls.

The hospital sits upon a small rocky rise of black volcanic rock.

It provides the highest exposure of volcanic rock on the island.