Think back to our work on Rocks and Minerals.

Question

Coal is a very useful resource that formed over millions of years ago from the remains of dead plants.

Which two of the following statements are true about coal.

(2 points)
Responses

Coal is a mineral
Coal is a mineral

Coal is a rock
Coal is a rock

All rocks that are useful to people are minerals
All rocks that are useful to people are minerals

Coal is not a mineral because it is made of organic materials

Answer 1

The two true statements about coal are:

1. Coal is a rock - Coal is classified as a sedimentary rock formed from the accumulated remains of ancient plant material.

2. Coal is not a mineral because it is made of organic materials - This is true because minerals are defined as naturally occurring inorganic substances with a specific chemical composition and crystalline structure, while coal is organic in origin.

So, to summarize, the correct true statements are:

• Coal is a rock.
• Coal is not a mineral because it is made of organic materials.