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