At the other, the concentrations were such that it seems certain the rock was mined.

The boats could not approach nearer because of certain rocks in the water.

They seemed to be queuing up to pass around a certain big rock.

If you are of a certain rock 'n' roll age, you might not think the universe needs any new laws either.

Howard pointed up to certain rocks which they had been about to cross.

We knew that fine bass were finning near certain rocks.

There was also a puzzle element to the game, as certain rocks were used to reach high areas.

The pieces of the canoe are certain rocks in the sea.

His theory essentially held that mountains were created by the squeezing of certain rocks.

When close to the surface, certain rocks affect the Earth's normal magnetic field.