The Nitrogen Cycle Crossword
This printable crossword puzzle on the topic of Ecology & Evolution has 10 clues. Answers range from 7 to 16 letters long. This crossword is also available to download as a Microsoft Word document or a PDF.
Description
The envelope of gases surrounding the earth or another planet.
Air that surrounds the planet Earth and is retained by Earth's gravity.
An organism, especially a soil bacterium, fungus, or invertebrate, that decomposes organic material
78 percent of the earth's atmosphere
The biological oxidation of ammonia or ammonium to nitrite followed by the oxidation of the nitrite to nitrate
A colorless gas with a characteristic pungent smell.
A salt or ester of nitric acid, containing the anion NO3− or the group —NO3.
The chemical processes by which atmospheric nitrogen is assimilated into organic compounds, especially by certain microorganisms as part of the nitrogen cycle.
Reduction of nitrates or nitrites commonly by bacteria.
Decomposition with production of ammonia or ammonium compounds especially by the action of bacteria on nitrogenous organic matter.
