This factory is emitting a large amount of sulfur dioxide.

Silicon dioxide is a major component of glass and ceramics.

Nitrogen dioxide is a cause of air pollution.

Tridymite, in mineralogy, is a type of silica and is often found in volcanic rocks.

This is a kind of flower.

This area is rich in volcanic rock, making it an interesting place for geologists.

Silicon is widely used in the manufacture of semiconductors.

This wristwatch uses quartz.

This area is known for producing a variety of minerals.

Carbon dioxide is one of the main causes of global warming.