Across
- 4. to follow or track something
- 6. a number of things happening one after the other
- 7. to remove natural resource from the earth
- 8. causes fish populations to drop
Down
- 1. a place for catching fish and sea animals
- 2. the elevation which trees stop growing
- 3. to leave a country to leave in another
- 5. the cultivation of aquatic plants for food