Across
- 3. An opening in Earth's crust that throws out hot lava and ash.
- 4. A long, natural stream of water that flows into the sea.
- 7. The low land sitting between two mountains or hills.
- 8. Living things that grow in the ground and need sunlight.
- 11. Moving ridges of water on the surface of the sea.
- 12. A thick, tropical forest with lots of rain and tall trees.
- 13. Close to something; the opposite of far.
- 15. The huge, empty area outside the Earth's atmosphere.
Down
- 1. A very large number, written as 1,000,000.
- 2. A large round object in space that circles a star, like Earth.
- 5. A huge body of salt water that covers most of the Earth.
- 6. A place where water flows over the edge of a cliff or rock.
- 9. The top layer of earth where plants grow; dirt.
- 10. A very tall, natural stone structure reaching high into the sky.
- 11. The clear liquid we drink to stay alive.
- 14. A solid, hard piece of Earth's surface.