INTRODUCING ENERGY Across 1. Energy usually associated with mass destruction. 4. Hydroelectricity is produced through the use of this state of matter. 5. The source of almost all energy on the planet earth. 10. Energy is neither destroyed or all used up but transformed. 11. The energy people get from food. Down 2. Most used form of energy. 3. Energy named after the Greek word 'kinesis.' 6. Stored energy. 7. Fuels formed millions of years ago from the remains of animals and plants. 8. Energy produced from two surfaces hitting each other. 9. This form of energy is sometimes called 'Wasted Energy.' 12. The ability to do work.