Across
- 2. Small pieces of matter; can refer to atoms or molecules.
- 4. Northern Lights; natural light display in the sky.
- 5. The process of being worn away by natural forces like water.
- 9. Marine organism that builds reefs; often colorful and diverse.
- 11. Observable events, often unusual or remarkable.
- 12. An opening in the Earth's crust that can erupt with lava.
- 13. Offering a wide view of an area; comprehensive in scope.
- 14. Relating to a nation; often refers to parks or monuments.
- 15. A structure built to remember a person or event.
- 18. A community of living organisms and their environment.
- 20. Relating to the structure and substance of the Earth.
- 21. Small shaking movements, often caused by geological activity.
Down
- 1. Referring to the Northern Lights, especially aurora borealis.
- 3. The visible features of an area of land; scenery.
- 6. The action or process of observing something to gain information.
- 7. A ridge of rocks or coral in the sea, often supporting marine life.
- 8. A deep valley with steep sides, often carved by a river.
- 10. Covering a wide area; extensive.
- 16. A journey undertaken for a specific purpose, especially exploration.
- 17. The highest point of a mountain or hill.
- 19. The height of something above sea level.