Matter & Energy CW 2

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Across
  1. 3. average weather conditions in an area over time
  2. 9. process that changes atmospheric nitrogen into compounds usable by living things
  3. 12. organisms that do not need to eat other organisms to obtain energy
  4. 13. single path model showing how energy flows in an ecosystem
  5. 14. to set free
  6. 17. multi path model of energy transfer showing how the food chains in a community are interconnected
  7. 19. animals that hunt other animals
  8. 20. animals that are hunted
  9. 21. process using chemical energy in matter to make food
Down
  1. 1. series of chemical reactions that convert light energy, water, and carbon dioxide into the food-energy molecule glucose and give off oxygen
  2. 2. process during which water vapor changes into liquid water
  3. 4. __________ factors are living things in an ecosystem
  4. 5. unicellular organisms without a membrane-bound nucleus
  5. 6. water that falls from clouds to Earth’s surface
  6. 7. layer of gases surrounding Earth
  7. 8. organisms that must eat other organisms for energy
  8. 10. process during which liquid water changes into water vapor
  9. 11. _________ factors are nonliving things in an ecosystem
  10. 15. living and nonliving things in a given area
  11. 16. model showing the amount of energy available in each step of a food chain
  12. 18. cannot be separated by chemical means