Vocab Words I did not know

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Across
  1. 6. alternative form of a gene
  2. 7. two objects used in simple machines
  3. 8. sinking cold air mass
  4. 10. two equal forces pushing away from each other
  5. 11. accomplishment of completing a job with reasonable time and effort
  6. 12. circut with more than one path
  7. 13. cold air under a warm air mass
Down
  1. 1. winds that travel great distances with steady patterns
  2. 2. tiny cell structure in an organism
  3. 3. rigid bar that moves objects around
  4. 4. single parent reproduction
  5. 5. condition of earth's atmosphere
  6. 9. rises from left to right