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