Science Quiz I

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Across
  1. 2. a wheel with a groove in which a rope can run.
  2. 7. the act of spreading outward from a central source.
  3. 12. metabolic equilibrium maintained by biological mechanisms.
  4. 13. small extraterrestrial body that hits the earth's atmosphere.
  5. 15. part of DNA controlling physical characteristics and growth.
  6. 16. the invasion of the body by pathogenic microorganisms.
  7. 17. the formation of reddish-brown on iron by oxidation in the presence of water.
  8. 18. taxonomic group whose members can interbreed.
  9. 20. animal hunted or caught for food.
Down
  1. 1. the relation between two organisms that benefit each other.
  2. 3. mass in motion.
  3. 4. method of growing plants without soil.
  4. 5. the slow passage of a liquid through a filtering medium.
  5. 6. length of one complete cycle of a wave.
  6. 8. a material with little electrical or thermal conductivity.
  7. 9. a tentative insight that is not yet verified or tested.
  8. 10. the tendency of something to stay in rest or motion.
  9. 11. a structure in an animal specialized for some function.
  10. 14. energy the mechanical energy that a body has by virtue of motion.
  11. 19. rate at which electrical energy is supplied to a circuit.