Pick your way atop the huge lava rocks until you see the pool.

A woman was walking down the lava rocks toward us.

Five meters to our left and the lava rocks began.

What if he found himself on Earth when it was all a bunch of hot lava rock?

Their feet striking onto a thick layer of lava rock.

He took them across the stretch of lava rock and back into the ravine.

One man's face was pitted all over like a chunk of lava rock.

It was a large room of hard, brown lava rock.

He looked for a crack in the lava rock, but failed to find one.

The first thing I did was hunt a piece of black lava rock to use when the time came.