Multiple choice

Which of the following has been formed differently from the other three?

  1. Peat

  2. Bituminous

  3. Lignite

  4. Graphite
Reveal answer Fill a bubble to check yourself
D Correct answer
Explanation

Peat, bituminous, and lignite are all types of coal - sedimentary rocks formed from compressed plant matter. Graphite, however, is a mineral (a form of carbon) formed through metamorphic processes, not from the coal formation pathway. It has a completely different origin and crystal structure.

Keep practicing — related questions