Across
- 2. an increase of nutrients, especially phosphorus and nitrogen, in a body of water that causes algae blooms that block sunlight and lower oxygen levels.
- 5. a body of water that is home to living and nonliving things.
- 6. animals or plants that are not native to an ecosystem but are introduced, often by humans.
- 8. an addition of harmful chemical substances into a body of water.
- 9. too much loud or harmful sound in the environment.
- 10. a barrier built across a river or stream to control water flow so it can be used in different ways.
Down
- 1. a change in the structure of a body of water.
- 3. an addition of natural substances into a body of water.
- 4. when too many fish are caught from a body of water faster than they can reproduce.
- 7. a change in temperature of a body of water.