Nature

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Across
  1. 2. the combination of smoke and fog caused by pollution
  2. 4. smoke or gas that has a sharp smell when inhaled or is harmful when inhaled
  3. 5. the light coming from the moon
  4. 6. the rise and fall of the ocean level
  5. 8. the time just before the sun sets
  6. 10. without any light
  7. 11. very sharp incline
Down
  1. 1. the green and red lights that appear in the sky in the northern hemisphere
  2. 2. having a number below zero degrees
  3. 3. the existence of a range of plants and animals in a natural enviroment
  4. 7. a sudden fall of rock or dirt down a mountain or steep hill
  5. 9. the time just before the sun rises