Natural Cycles Crossword Puzzle

QUESTIONS LIST: bio geo chemical cycle : the cycling of chemical elements through living and nonliving parts of an ecosystem, runoff : the precipitation that flows over the surface of soil, nodule : a swelling on a plant root that contains nitrogen-fixing bacteria, cellular respiration : the process in cells by which oxygen and glucose are used to produce energy and carbon dixoide, legume : a plant that hosts nitrogen-fixing bacteria in nodules on its roots, photo chemical smog : the brown smog produced when air pollutants react with sunlight, acid precipitation : the precipitation that is more acidic than normal rainwater, collection : the process by which precipitation is gathered into a body of water, photosynthesis : the process that allows green plants to make sugars from sunlight, water, and carbon dioxide into oxygen, emission : a pollutant released into the atmosphere, denitrification : the process that releases nitrogen from soil back into the atmosphere, nitrogen fixation : the conversion of nitrogen in the atmosphere to a form that can be used by plants