Water and Oxygen

• Terminology related to cycles

  • Condensation
  • Precipitation
  • Infiltration
  • Evaporation
  • Transpiration
• Condensation


  The change of water from gaseous into liquid form
• Precipitation


  Water moves from the atmosphere to earth in the form of rain, mist, hail, dew, and snow
• Infiltration


  Water infiltrates deep into the soil and comes to rest on solid rock formation to create the water-table
• Evaporation


  The process of turning from liquid into vapor
• Transpiration


  Loss of water vapor through the stomata of the leaves
• Photosynthesis


  The process whereby plants absorb CO2 and release O2 in the atmosphere as a by-product
• Combustion


  Reaction of a substance with oxygen as in burning
• Respiration


  The chemical process whereby energy-rich molecules, for example, glucose, are chemically broken down to release energy
• Water is an inorganic compound with two hydrogen atoms and one oxygen atom. It can exist in three phases in the environment, i.e. solid, liquid, and gas
• The water-cycle


  Circulating water through the organisms and the environment during the process of evaporation, condensation, precipitation, and run-off
• Water vapour rises into the atmosphere

  It condenses to form clouds, and precipitates back to earth in the form of rain, hail, and snow
• The water fills streams and rivers


  Eventually flows in the oceans where evaporation starts the process again