Across
- 2. a river or stream flowing into a larger river or lake
- 5. a tributary stream of a river close to or forming part of its source
- 9. cut down and remove every tree from (an area)
- 10. rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes
- 13. an artificial channel for conveying water, typically in the form of a bridge across a valley or other gap
- 14. a tree or shrub that grows in chiefly tropical coastal swamps that are flooded at high tide
- 15. a very large, heavily populated city or urban complex
Down
- 1. a natural fuel such as coal or gas, formed in the geological past from the remains of living organisms
- 3. the area where an upland region and a coastal plain meet and is typically prominent where rivers cross it, with resulting rapids or waterfalls
- 4. a storm with a violent wind, in particular a tropical cyclone in the Caribbean
- 6. a method of farming in semiarid areas without the aid of irrigation, using drought-resistant crops and conserving moisture
- 7. (in the southern US) a marshy outlet of a lake or river
- 8. excessive richness of nutrients in a lake or other body of water, frequently due to runoff from the land, which causes a dense growth of plant life and death of animal life from lack of oxygen
- 11. an artificial waterway constructed to allow the passage of boats or ships inland or to convey water for irrigation
- 12. fog or haze combined with smoke and other atmospheric pollutants