"The Red Planet"

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Across
  1. 5. new and better ways of doing things
  2. 6. things that are alive, like people, animals, and plants
  3. 7. turns red and flaky when metal gets wet and old
  4. 10. closest in distance
  5. 11. to look at something carefully to learn about it
  6. 12. how much flat space something has on the outside
  7. 13. something that cannot be done
  8. 18. two times as much
  9. 19. the use of science tools or ideas to do or make things
  10. 20. how hot or cold something is, such as air
Down
  1. 1. bowl-shaped dents in the ground caused by large space rocks hitting a planet or moon
  2. 2. dirt or ground where plants can grow
  3. 3. clues that something living is or was there
  4. 4. a machine (like a spaceship) with no people inside
  5. 8. the top and bottom ends of a planet
  6. 9. the parts or shapes that make something look the way it does
  7. 14. traveled around something in a curved path
  8. 15. farther away than something else
  9. 16. the air or gases that surround a planet
  10. 17. to give an idea about something