The Carbon Cycle

Name: ______________________   Date: ____________

Use the clues to fill in the crossword.

Across

  1. 2. Slippery liquid used for cooking and fuel (3)
  2. 3. Living things like dogs and birds (7)
  3. 8. A heavy odorless colorless gas formed during respiration and by the decomposition of organic (13)
  4. 9. An inferior state resulting from the process of ___ (5)
  5. 10. Living things like trees and flowers that grow in soil (6)
  6. 11. A sedimentary rock consisting mainly of calcium that was deposited by the remains of marine animals (9)
  7. 14. A fossil fuel in the ___ state (10)
  8. 15. The metabolic processes whereby certain organisms obtain energy from organic molecules (11)

Down

  1. 1. Fossil fuel consisting of carbonized vegetable matter deposited in the Carboniferous period (4)
  2. 4. The phenomenon of ___ or gravel accumulating (13)
  3. 5. The bodily process of inhalation and exhalation (9)
  4. 6. Utility to warm a building (7)
  5. 7. Layer of air around the Earth (10)
  6. 8. A substance formed by chemical union of two or more elements or ingredients in definite proportion (plural) (9)
  7. 12. A soft whitish calcite (5)
  8. 13. The act of ___ something (7)