Across
- 2. to decay by a gradual, natural process
- 6. difficult to live or stay in because of severe weather conditions
- 10. one of many small planets
- 12. to come off in layers from the surface of an object
- 13. to transform a planet to support human life and look like Earth
- 14. to control an area and send your own people to live there
- 15. a form of energy that comes from nuclear reactions, that is harmful
- 18. to attack a place
Down
- 1. a list of the places you will visit on a trip
- 3. to fall down or inward suddenly
- 4. a vehicle that travels on the surface of a planet
- 5. trip a journey made to and from within a day
- 7. ahead to make all arrangements in advance of something happening
- 8. to break apart in small pieces
- 9. having a layer of thick furry plant usually growing on soil, trees, or rocks
- 11. old, broken, and in very bad condition
- 16. out to make thorough and detailed arrangements for the future
- 17. season the time of year when businesses have fewer visitors and prices are cheaper