The Environment Day

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Across
  1. 2. dying out of a species
  2. 4. living things in the environment
  3. 6. layer of air surrounding the earth
  4. 8. the gas we can't live without
  5. 9. the most important gas in the atmosphere
  6. 10. the blue planet
Down
  1. 1. a linear sequence of organisms through which nutrients and energy pass as one organism eats another
  2. 3. the erosion of the top layer of dirt known as topsoil
  3. 5. the introduction of harmful materials into the environment
  4. 7. cutting down of trees on a large scale