Natural Resources

123456789
Across
  1. 2. Endoskeleton and Exoskeleton of various animals are made up of ______ salts
  2. 7. Diamonds have carbon in ______ form
  3. 8. Oxygen is returned to atmosphere by this one major process
  4. 9. it converts Nitrogen into oxides of nitrogen
Down
  1. 1. life forms that cannot tolerate high amount of dissolved salts in saline water
  2. 3. acids
  3. 4. part of many molecules essential to life
  4. 5. fossil fuels contain small amount of Nitrogen and_______
  5. 6. absorbs harmful UV radiation of sun