REFERENCE SECTION: NATURAL CYCLES
The biogeochemical recycling of nitrogen, carbon, and water are three
important examples of matter being continually recycled in Nature.  *

Complete this first diagram, which is a simplified summary of the
Nitrogen cycle, by inserting the name of the correct process from this 
list: Absorption; Biological fixation; Death; Decay; Denitrification; 
Electro- and Photo-chemical fixation; Feeding; Leaching; Nitrification.

Complete this second diagram, which is a simplified summary of the
Carbon cycle, by inserting the name of the correct process from this 
list: Combustion; Decomposition (anaerobic); Feeding; Photosynthesis; 
Respiration.

Complete this third diagram, which is a simplified summary of the
Water cycle, by inserting the name of the correct process from this
list: Absorption; Condensation; Drainage; Evaporation; Precipitation;
Transpiration.

*  Ecology is the study of how organisms interact with their physical
and biological environments; and how these interactions influence both 
the distribution and abundance of living organisms: in practice, since
the Industrial Revolution, the greatest influence has been Man.

Dr. R. Peters                   Next                     Contents' List