Science

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Across
  1. 4. two or more individuals or populations try to use the same resource
  2. 6. the bubbles in the crest of a breaking wave
  3. 8. the change of substance from a liquid to a gas
  4. 9. the lowest layer of the atmosphere
  5. 12. the burning of a substance
  6. 14. the study of the interactions of organisms with one another and with their environment
Down
  1. 1. a wetland ecosystem in which shrubs and trees grow
  2. 2. living elements in the environment
  3. 3. tiny organisms that float near the surface of the water
  4. 4. the change of gas to liquid
  5. 5. the movement off air caused by air pressure
  6. 7. a mixture of gases that surrounds a planet or moon
  7. 10. a grassland with very few trees
  8. 11. the amount of water vapor in the air
  9. 13. smoke and fog