Environmental problems

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Across
  1. 4. change changes in the Earth's weather patterns
  2. 5. slick a thin layer of oil that is floating on the surface of the ocean, a lake, etc.
  3. 7. the act or result of cutting down or burning all the trees in an area
  4. 8. the action or process of making land,water,air,etc.,dirty and not safe or suitable to use
Down
  1. 1. a situation in which too many people live in a certain area and this is a problem
  2. 2. rain rain that contains dangerous chemicals because of smoke from cars and factories
  3. 3. pollution the addition of harmful chemicals to natural water.
  4. 6. warming the recent increase in the world's temperature that is believed to be caused by the increase of certain gases (such as carbon dioxide) in the atmosphere