C.B puzzle

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Across
  1. 1. The Colorado mountain range
  2. 3. Einstein came up with this
  3. 4. The longest opera in history
  4. 5. The planet we live on
  5. 6. The supposed case of the black death
  6. 7. Has many multi-coloured rings for the logo
Down
  1. 2. The largest mountain in japan
  2. 4. An extinct bird
  3. 5. Tallest mountain on earth