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  3. Earth Science
  4. Geology
  5. Earth's Rocks
  6. Earthly Treasures

  • Earthly Treasures: Gold

    Earthly Treasures: Gold

    Why is gold revered as a precious metal?

    Earthly Treasures: Diamonds

    Earthly Treasures: Diamonds

    What makes diamonds so valuable?

    Earthly Treasures: Precious Gemstones

    Earthly Treasures: Precious Gemstones

    How are emeralds, rubies and sapphires formed?