The environment

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Across
  1. 5. the layer that protects us from UV rays
  2. 6. invasive plnats or animals in a new environmemt
  3. 7. the gradual increase of earth’s temperature
  4. 9. gas essential for human breathing
  5. 10. type of bag banned in many countries
Down
  1. 1. when trees are cut down in large numbers
  2. 2. a gas that contributes to the greenhouse effect
  3. 3. a practice of separating paper, plastic and glass
  4. 4. a large area covered with trees
  5. 8. a renewable energy source that uses the sun’s ray