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Across 5. Fastest seismic waves 6. Studies earthquakes 8. Volcanic bombs the size of golf balls 11. Volcanoes made mostly from cinders 12. Large particles blown from volcanoes 14. A shield volcano 17. Built up of alternating layers 20. Small particles blown into the air 21. Strength of earthquakes 22. Pacific earthquake and fire zone 23. Magma that reaches the Earth's surface

Down 1. Hot liquid rock 2. Earthquake's point of origin 3. Don't travel through liquid 4. Giant Sea Waves 6. Composed of quiet lava flows 7. Opening from which lava erupts 8. A volcanic crater whose walls have colapsed 9. Earthquake waves 10. Teeny, tiny volcanic ash 13. The pit at the top of a volcanic cone 15. Directly above the focus 16. A composite volcano 18. Surface waves 19. Measures seismic waves