Across
- 4. A stream of water falling from a height.
- 6. A landform at a river's mouth.
- 8. Marine invertebrates that form reefs.
- 9. A small body of still water.
- 13. A vast expanse of saltwater.
- 14. A dry, barren area of land.
- 17. A large, slow-moving mass of ice.
- 19. A natural elevation smaller than a mountain.
- 21. A dense tropical forest.
- 23. A ridge of rocks or coral near the sea's surface.
- 24. A high, natural elevation of land.
- 27. A field of grass and flowers.
- 28. Water falling from the sky.
- 29. A grassy plain with sparse trees.
Down
- 1. A mountain that erupts molten rock.
- 2. A wetland with trees and vegetation.
- 3. A small, narrow flowing body of water.
- 5. An open area of land, often used for farming.
- 7. A shallow body of water separated from the sea.
- 8. A hollow area in the earth.
- 10. A mound of sand formed by the wind.
- 11. A low area between hills or mountains.
- 12. A sandy or pebbly shore.
- 15. A flowing body of water.
- 16. A steep face of rock or earth.
- 18. A deep gorge, often with a river.
- 20. A piece of land surrounded by water.
- 22. A large, flat, grassy plain.
- 25. A cold, treeless plain.
- 26. A large area covered with trees.