This mineral is called lepidocrocite, a type of iron oxide.

Fiber optics is a part of communication technology.

This structure has existed for centuries.

My major is chemical engineering.

He is an expert in mineralogy.

They used Euclid's algorithm to find the greatest common divisor.

I like reading uncle's composition.

She is interested in spiritualism.

Today's precipitation was 50 millimeters.

On this road, the principle is to keep left.