Energy

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Across
  1. 3. Dam the highest in Thailand
  2. 6. 3rd longest
  3. 10. A land of fire and frozen water
  4. 11. Looks good on a roof
Down
  1. 1. Carboniferous period
  2. 2. Birds beware
  3. 4. Russia has a bit
  4. 5. Rivers are the source
  5. 7. Very, very dangerous!?
  6. 8. Vehicles love it
  7. 9. Off limits for a long time