Clean and Energy

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Across
  1. 2. A curved pipe that was used to make the first flushing toilet.
  2. 3. A system added to cities in order to help wuth hygiene and waste disposal
  3. 5. A black rock burnt for fuel.
  4. 7. A type of energy produced through currents that led to the replacement of gas lamps.
  5. 8. A heat engine that performs work using steam as fuel
Down
  1. 1. The process foods like milk go through to become safe to eat.
  2. 4. Microorganisms that cause disease
  3. 6. The idea that some diseases are caused by microrganisms and bacteria