environmental sanitation

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