Across
- 3. a natural flowing watercourse, usually freshwater, flowing towards an ocean, sea or lake.
- 6. is a form of matter having constant chemical composition and characteristic properties.
- 7. is a synonym of garbage
- 8. is the polluted form of water generated from rainwater runoff and human activities.
- 9. covers approximately 70.8% of the surface of Earth and contains 97% of Earth's water.
Down
- 1. is a narrow strip of land separating a body of water from inland areas.
- 2. is an organism that lives on or in a host organism and gets its food from or at the expense of its host.
- 4. are small single-celled organisms.
- 5. is the main constituent of Earth's hydrosphere and the fluids of all known living organisms.