Environment

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Across
  1. 4. A process by which dead organic substance are broken into simple organic or inorganic matter
  2. 7. The surface of earth gradually lost or destroyed over time is called ___
  3. 8. A group of living organisms having similar characteristics to each other
  4. 9. Introduction of harmful material into the environment
  5. 10. Rise and fall of sea that happens twice every day
Down
  1. 1. A cold-blooded vertebrate that lives on land and water
  2. 2. Any form of precipitation from the atmosphere with acidic components
  3. 3. An underground layer of rock through which water can easily move is called ____
  4. 5. A period of less rain than usual
  5. 6. A place in which the land is covered by water