Multiple choice general knowledge

If you were to take a lump of coal and squeeze for a long time at very high temperatures, you would end up with:

  1. graphite

  2. volcanic glass, also known as obsidian

  3. a smaller lump of coal

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

Diamonds are formed when carbon-containing materials (like coal) are subjected to extreme pressure and heat over long periods in Earth's mantle. The carbon atoms rearrange into a crystal lattice structure, creating diamonds. Graphite requires different formation conditions, obsidian is volcanic glass, and coal doesn't just become a smaller version of itself.

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