Across
- 7. atoms that have a nucleus that is unstable and decomposes spontaneously
- 9. heat within the earth
- 10. measurement of the rate of decomposition for any given isotope
Down
- 1. the process of splitting the nucleus of an atom that is "fissionable"
- 2. resources that are used much faster than they can be produced; amount is limited
- 3. clean, renewable energy source
- 4. solid-state semiconductor devices that convert light directly into electricity
- 5. replenish themselves as a continuously present feature of the solar system
- 6. light energy is transformed to heat energy when it is absorbed by a surface
- 8. requires a solar collector, a pump and a system of pipes to transfer heat from the site of production to the area to be heated