Multiple choice general knowledge science & technology

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. A smaller lump of coal

  3. A diamond

  4. Volcanic glass, also known as obsidian
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

Diamonds are formed from carbon (coal is primarily carbon) subjected to extreme heat and pressure over long periods deep within the Earth. This process transforms the carbon atoms into a crystalline structure. Graphite is also carbon but requires different conditions, while obsidian is volcanic glass.

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