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Across 7. scale to measure the strength of an earthquake 9. rocks formed from sediments that have been pressed into rock 10. it's made up of humus and weathered rock 12. the volcanic belt that encircles the edge of the Pacific Ocean 14. sedimentary or igneous rock changed by heat or pressure 17. acids breaking down rock 20. a trembling or shaking of the earth's crust 21. the point underground where an earthquake begins 22. melted rock 23. the individual substances that make up rocks 24. lava fragments that solidify into rock instantly

Down 1. a break in rock at the boundary between two moving masses 2. an escape vent for underground gases near active volcanoes 3. rocks that form when molten rock solidifies 4. water, ice or windblown sand breaking down rock 5. rocks that bend without cracking 6. a weak earthquake 8. the place at ground level directly above the focus 11. a scientist who studies earthquakes 13. breaking of rock without any movement at the break 15. the innermost region of the earth 16. scientist who studies the earth 18. the boundary between the crust and the mantle 19. top layer of the earth ranging 40 miles to 3 miles thick