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13) Water is a molecule which can be found in solid, liquid and gas

14) Water comes to the earth through precipitation.

15) Nitrogen is found on the earth in the form of ammonia and nitrates.

16) Nitrogen is returned back to the atmosphere through denitrification process.

17) Carbon in the form of carbondioxide gas returns to atmosphere through volcanic activity, human activity and decomposition reactions.

18) Water goes to the atmosphere through evaporation and transpiration.

19) Phosphorus is present in rocks and sediment.

20) Carbon is the nutrient which is released back to the atmosphere through photosynthesis and respiration.

21) Phosphorus is not found in atmosphere.

22) Water is a nutrient goes back to the atmosphere in the vapour and forms clouds.

answer denitrification;