summary

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Across
  1. 5. exploded crater
  2. 9. sinus shaped wave of earthquake
  3. 10. the lowest quality of coal
  4. 12. name of a scale based on measures
  5. 16. moving crack in a plate
  6. 17. a kind of wetland
Down
  1. 1. flat terrain below sea level
  2. 2. a huge piece of crust
  3. 3. fuel of airplanes
  4. 4. bedrock of railways
  5. 6. official sea level (name of the sea)
  6. 7. it covers gas and oil in a folded structure
  7. 8. wind, hydroenergy, biomass, tide, solar energy
  8. 11. top of the volcano
  9. 13. porous volcanic rock
  10. 14. organization of oil producers
  11. 15. steep sided volcano made by various layers