Scientific reading

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Across
  1. 2. to separate things
  2. 4. harmful things added to the environment
  3. 6. how clean or uncontaminated something is
  4. 8. it keeps things working even when it’s hot
  5. 9. related to heat
  6. 14. A recycling sister
  7. 15. a large area where trash is buried
Down
  1. 1. a type of enzyme that breaks molecules apart
  2. 3. a “machine” made of proteins
  3. 5. rotting plant or food waste that becomes soil
  4. 7. the code inside all living things
  5. 10. so small that it can only be seen with a microscope
  6. 11. substances change into something new
  7. 12. to melt or change the shape of something
  8. 13. a particle that makes up everything