Across
- 1. a natural saltwater ecosystem with lots of fish and sand
- 4. an artificial ecosystem that is smaller than a city
- 7. a natural ecosystem with lots of trees, water, and soil
- 9. changed by human activity
- 10. a natural freshwater ecosystem that is narrow and has lots of fish
- 11. a natural ecosystem that is very cold and snowy
Down
- 2. an artifical ecosystem with lots of buildings, shops, and people
- 3. a natural ecosystem with dry air and lots of sand
- 5. unchanged by human activity
- 6. a natural ecosystem with lots of grass and very few trees
- 8. an artificial ecosystem with grass, benches, fountains, and playgrounds