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Across 3. A seismic wave that travels along the earth's surface 4. A seismic wave that travels through the body of a medium. 5. The point of origin of an earthquake. 6. Magma or igneous rocks consisting chiefly of feldspars, feldspathoids, quartz, and other light-colored minerals. 8. A region of numerous, closely spaced faults. 9. Magma or igneous rocks consisting of dark, ferromagnesian minerals 10. An area on Earth's surface where no direct seismic waves from a particular earthquake can be detected 12. A movement of the ground that is caused by a sudden release of energy when rocks along a falut move 15. The phenomena connected with volcanoes and volcanic activity. 17. Liquid rock beneath or within the earth's crust, from which igneous rock is formed 18. The amount of damage caused by an earthquake. 19. A break in a body of rock along which one block slides relative to another

Down 1. A large depression resulting from the explosion or collapse of the center of a volcano. 2. Shock waves in solid rock generated by earthquakes or underground explosions. 3. An instrument for measuring and recording the vibrations of earthquakes. 7. The molten, fluid rock that issues from a volcano or volcanic vent. 11. An intervening substance through which a force acts or an effect is produced 13. A point directly above the focus. 14. A measure of the strength of an earthquake 15. A vent in the earth's crust through which lava, steam, ashes, etc., are expelled. 16. A large sea wave produced by a seaquake or undersea volcanic eruption.