Across
- 8. underwater mountains formed by volcanoes. These mountains have not yet reached the surface
- 9. the location where a freshwater river or stream meets the ocean
- 11. primarily caused by contamination of drinking water by human and animal waste and causes the most human health problems of any type of pollution
- 12. used to determine the effect that a chemical or pollutant has on a living organism
- 13. an aggregate of pollution from a large area
- 14. the process of creating, enlarging, or preserving wetlands due to human impacts
- 15. _______ consists of undersea mountain chains all around the world.
Down
- 1. can be traced back to a specific point
- 2. the steep gradient that leads to the deep-ocean floor and marks the seaward edge of the continental shelf
- 3. makes up less than 3% of Earth’s water supply
- 4. When animals ingest POPs, they are absorbed into fatty animal tissue because they are fat-soluble. this process is known as ______.
- 5. the gently sloping underwater surface extending from the shoreline
- 6. biomes cover around 97% of Earth’s surface
- 7. underwater mountains formed by volcanoes. These mountains did reach the surface but have since collapsed to form flat tops
- 10. islands above sea level formed by volcanic activity, such as Hawaii