Question

1. which of the following is a description of a mineral?

a man - made substance that has a crystalline structure
a naturally occurring solid with a definite crystalline structure
a naturally occurring solid made out of substances that were once living
a solid or liquid that has a random structure

Explanation:

Minerals are defined as naturally occurring, inorganic solids with a definite chemical composition and an ordered crystalline structure. The correct option matches this core definition, while the others are incorrect: minerals are not man-made, not derived from once-living material, and are solids with ordered (not random) structures.

Answer:

a naturally occurring solid with a definite crystalline structure