We are working with a different kind of rock here, in many layers.

It was the same kind of rock as this, he recalled with a shiver.

Each performer created his own kind of rock and roll.

There's no radio signal can go through that kind of rock.

It was a kind of rock 'n' roll home school.

It is found in many different places in almost all kinds of rock.

And even when they dig it up, it's mixed with other kinds of rock.

A kind of rock that's harder and sharper than almost any other.

It was the same kind of rock as the plain's surface off the road.

We can tell from the kind of rock they're in.