Across
- 4. a common scientific survey method used to sample fish populations
- 6. the action or state of making or being made impure by polluting or poisoning
- 9. a biological community of interacting organisms and their physical environment
- 10. an area of land that drains all the streams and rainfall to a common waterbody
- 12. tending to spread prolifically and undesirably or harmfully
- 16. the systematic investigation into and study of materials and sources
- 17. the invisible mixture of gases that envelope the planet
- 18. the process by which plants use sunlight, water, and carbon dioxide to create oxygen and energy
Down
- 1. a group of people living in the same place
- 2. polished beads created from the shell of a clam pierced and strung in strands, belts, or sashes
- 3. the cleanup, removal, treatment, and/or containment of hazardous substances, pollution, or contaminants
- 5. originating or occurring naturally in a particular place; native
- 7. airborne chemicals that have antifungal and antibacterial properties and protect plants from disease and insects
- 8. able to withstand or recover quickly from difficult conditions
- 10. a freshwater fish in the perch family, also called the yellow pike or yellow pikeperch or yellow pickerel
- 11. organic material that comes from plants and animals
- 13. the geological process in which earthen materials are worn away and transported by natural forces
- 14. the process of recycling organic matter, such as leaves and food scraps, into a valuable fertilizer
- 15. an aquatic or terrestrial annelid worm with suckers at both ends
- 19. People of the Longhouse