Across
- 2. the electronic ________________ sends information from telephones, TVs, and computers.
- 5. what the photoelectric cell produces
- 7. What was the major source of energy in the nineteenth century?
- 10. tool that provides high-energy beams of light.
- 12. technology has improved it with surgery and lasers.
- 13. the land, sea and air of our world.
Down
- 1. They have designed new cars and invented medical machines.
- 3. the ___________________ cell can produce electricity from light.
- 4. without energy, this cannot be done.
- 6. What the electronic superhighway sends
- 8. The major source of energy in the twentieth century
- 9. making water, air, or land unclean and unhealthy.
- 11. energy makes _______________ work.