Scientific vocabulary

Edit Answers
123456789101112
Across
  1. 5. a process in which oxygen is utilised by living organisms for their daily needs.
  2. 7. a compound of hydrogen and carbon.
  3. 9. The loss of nitrogen from soil by biological or chemical means.
  4. 11. thick blanket of air
  5. 12. gases in Earth's atmosphere that trap heat.
Down
  1. 1. the process where organic forms of nitrogen are converted to NH4+.
  2. 2. three atoms of oxygen combined to absorb harmful uv rays
  3. 3. burning of a substance in which oxygen helps in burning.
  4. 4. CH4
  5. 6. harmful and powerful rays of the sum.
  6. 8. a process in which intake of nitrogen takes place in living organisms
  7. 10. a process in which plants take in carbon dioxide and release oxygen to obtain food.