A rock usually contains two or more types of minerals.

Most rocks and soils contain some few parts per million of it.

Although the rock contains iron, the levels are low and little attempt was made to extract it.

A rock containing enough metal to be profitable is called ore.

The rock, scissors, and paper commands will contain other moves which you may use.

When rock contains relatively few microscopic cracks, water doesn't get very far.

The rock of the continent itself contained the reaction.

The rocks also contained early forms of animal life.

A week later, just after the rock containing the mammoth had been hoisted into its tank, he was back.

In addition to water, the rock beneath Tuat contains pockets of natural gas.