cycles and decay

• give transfers in water cycle

  • evaporation
  • condensation
  • precipitation
• give transfers in carbon cycle

  • photosynthesis
  • respiration
  • nutrition
  • combustion
• describe decomposition

  break down of dead organic matter into simpler substances
• give factors affecting

  • oxygen availability
  • temperature
  • water content
• describe function of compost

  mix of decayed organic matter used as fertiliser
• describe affect on anaerobic decay

  produce biogas containing methane for fuel and sludge waste for fertiliser
• describe function of biogas generators

  produce methane in biogas for use as a fuel