environmental sanitation

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Across
  1. 3. biomass produced in past ages
  2. 6. caused by overflowing rivers, torrential rains, hurricanes and tidal waves
  3. 7. variation in the state of the climate system
  4. 8. is a mixture of organic substances
  5. 9. is the disappearance of all members of a species
  6. 10. natural environment encompasses all living and non-living
Down
  1. 1. convert waste into new products
  2. 2. energy from natural sources
  3. 4. environmental indicator
  4. 5. the introduction of substances into a medium that can cause this marine insecure
  5. 11. is the simplest alkane hydrocarbon