Earth

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Across
  1. 3. It’s what we walk,run,and stand on
  2. 4. There are about 8.3 million of this thing
  3. 7. the coldest place on earth
  4. 9. About 20 percent has been discovered
Down
  1. 1. There alive and grow but the don’t walk or run
  2. 2. It’s an animal and gives live brith
  3. 5. It’s about 4.54 billion years old
  4. 6. An imaginary line going across our earth
  5. 8. It’s what keeps us alive and gives us light
  6. 10. Its what we breathe