Earth Day

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Across
  1. 3. Company specializing in "same-day delivery"
  2. 6. Makes up over 70% of the Earth
  3. 7. Unique numeric code associated with a world in Minecraft
  4. 8. Second part of the three R's
Down
  1. 1. Greek mythology's ancestral mother goddess
  2. 2. City where an international climate treaty was adopted in 2015
  3. 4. NASA's latest mission to leave our homeplanet
  4. 5. Is a river in Egypt?