1. What are the main events in the water cycle?
    1. Terms to understand:
      1. runoff,
      2. watershed,
      3. ground water
      4. aquifer.
    2. What are the carbon and the nitrogen cycles? 
  2. Pollution
    1. What are the main types of pollution?
    2. What are:
      1. ozone layer,
      2. smog,
      3. acid rain,
      4. Global warming?
    3. How can water and soil be conserved?
    4. What are the 3 Rs of resource conservation?
    5. What are landfills?

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