"And there in that mass of rock I have found just the place for us."

He had felt that the great mass of rock was moving, pressing down upon him.

The mass of rock piled above him had never felt so heavy.

The mountains were pushed up around 5 million years ago, basically as one large mass of rock.

Is it true that a flaming mass of rock will hit us in 2012?

He was just in time to wrench him away from a mass of falling rock.

Each side passage ended in a mass of shattered rock.

It was the sound of rock masses shifting about somewhere far within.

The masses of rock provide protection from all but the most concentrated nuclear attack.

The charge was fired and a great mass of broken rock brought down inside the tunnel.