Across
- 2. Low land between hills or mountains
- 4. Land with water on all sides
- 6. Zone of the first few hundred meters deep of the ocean
- 9. Where the freshwater of a river meets the saltwater of the ocean
- 11. One of the two main types of rainforests. Moderate temperatures.
- 13. An area that is populated mostly by grasses and other non-woody plants
- 14. Type of forest that mostly contains coniferous trees
- 15. Extremely cold and dry biome
- 17. Zone between the highest high tide line and the lowest low tide line
- 19. Area of land with water on three sides
Down
- 1. Group of land ecosystems with similar climates and organisms
- 3. Features on the earth's surface
- 5. Receive less than 25 cm of rain per year
- 7. Number of continents on earth
- 8. Too deep for plants to grow on the bottom, so algae grow and float on top of the water
- 10. High steep-sided area rising above the surrounding land
- 12. Shallow enough for sunlight to hit bottom
- 15. One of the two main types of rainforests. Warm and humid temperatures
- 16. Type of tree that sheds its leaves and grows new ones each year
- 18. Zone below the surface zone