Ruby is a mineral form of

Options :
  1. Silicon Oxide
  2. Manganese Dioxide
  3. Beryllium Oxide
  4. Aluminium Oxide
Answer and Explanation :-

Answer: Option 4

Explanation:

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He brooded on how close destruction always was to all creatures, animals as well as humans, and he realized that there is nothing we can predict or know for certain in this world except death.
-Hermann Hesse The Fairy Tales of Hermann Hesse