Andrew crossword

12345678
Across
  1. 4. a period 10 years
  2. 6. the number that have 12 zeros
  3. 7. we need this to move
  4. 8. what we need to alive
Down
  1. 1. we need this to science
  2. 2. we can drink or alive
  3. 3. other word for human group
  4. 5. in maths we use this