Topic 5 Crossword

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Across
  1. 4. Chemical changes transformed the plant stems and leaves into a hard, black substance.
  2. 5. Using the energy of moving water.
  3. 6. Heat energy obtained from beneath the Earth's surface.
  4. 7. Gas A fossil fuel that occurs in the gas state.
  5. 9. Stores chemical energy and can convert that energy into electrical energy.
  6. 10. A device that changes energy of motion into electrical energy.
Down
  1. 1. A material that releases energy as heat when it burns.
  2. 2. Fuels Materials that formed as ancient plants and animals decayed underground.
  3. 3. Harmful substance.
  4. 8. A device that spins as the gas flows and changes the heat energy of the steam into energy of motion.