Question

unit test: composition of the earth - part 1 what characteristic makes a substance a mineral? it is only an organic compound. it has a definite chemical composition. it is lustrous. it is found in certain rock strata

Explanation:

A mineral is a naturally - occurring inorganic solid with a definite chemical composition and an ordered atomic arrangement.

• Option 1: Minerals are inorganic, not organic.
• Option 2: Having a definite chemical composition is a key characteristic of minerals.
• Option 3: Lustrous is a property (like a physical appearance property) but not the defining characteristic.
• Option 4: Being found in rock strata is not the defining characteristic.

Answer:

It has a definite chemical composition.