This scarce mineral is very expensive.

We must use the resources of the Earth carefully.

This area has a strong smell of sulfur.

Sulfur is a rare resource.

We should strive to protect water resources.

We must use natural resources carefully.

My grandfather participated in the Battle of Iwo Jima.

My grandfather participated in the Battle of Iwo Jima.

This factory is emitting a large amount of sulfur dioxide.

This lime sulphur is very effective in preventing pests and diseases in fruit trees.