Across
- 2. Interacting parts that make a complex whole
- 4. Raised domes with spread-out cracks on Venus
- 6. Breaking down rocks into smaller pieces
- 8. Solid part of a planet
- 9. All the living things on the planet
- 11. When two channels come together to make one channel
- 12. A long narrow groove that forms where water, lava, or other liquid flows
- 15. The shape of many small channels coming from the main channel
- 16. All liquid & frozen water of a planet
Down
- 1. A scientist who studies the states of matter of the Earth and other planets
- 3. An object, diagram or computer program
- 5. Melted rock
- 7. Mixture of gases surrounding a planet
- 10. or easier to see
- 13. A feature that forms on the surface of a planet, such as a mountain, channel or sand dune
- 14. helps us understand something by making it