Protecting the Planet Review Puzzle

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Across
  1. 6. the process where water moves through the plant, first absorbed by the roots and then expelled through the stoma
  2. 8. a resource that can be replenished is called a _____ resource
  3. 10. any nutrient that is only present in limited quantities in an ecosystem
  4. 11. the presence of harmful substances in the air
  5. 12. a tiny hole on the leaf of a plant through which water is expelled from the plant
Down
  1. 1. the continuous movement of nitrogen on earth through various stages
  2. 2. the stage of the water cycle where water in gas form turns back into a liquid and is collected into clouds
  3. 3. water in gas form
  4. 4. water that is underground
  5. 5. the destruction of forests
  6. 7. a harmful environmental contaminant
  7. 9. a repeating process that circulates an element or compound that is necessary for life is called a ____ cycle