Across
- 3. very old or old-fashioned.
- 6. when we can produce more energy than we need
- 9. to break or burst suddenly
- 10. the study of human history using dig sites and looking at artifacts
- 11. type of science studying the history of earth, especially as recorded in rocks
- 12. stop an activity
- 13. acting dishonestly
- 14. interrupt by causing a problem
- 15. burst
- 16. math that studies shapes and angles
- 18. a collection of historical records
Down
- 1. an alternative fuel often made from vegetable oil
- 2. heat from within the earth
- 4. someone who collects and maintains important records
- 5. electricity from flowing water
- 7. the study of the physical features of the earth
- 8. unable to pay old debts
- 17. volcano throwing out lava