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Across 4. stress that squeezes rock until it folds or breaks 8. change in volume or shape of Earth’s crust 9. type of seismic wave that move the ground up and down or side to side 10. force that acts on rock to change its shape or volume 12. the block of rock that forms the upper half of a fault 16. a mountain that forms where a normal fault uplifts a block of rock 21. an upward fold in rock formed by compression of Earth’s crust 24. a device that records ground movements by seismic waves as they move through Earth 25. stress that pushes a mass of rock in opposite directions 26. The shaking that results from the movement of rock beneath Earth's surface 27. a break in Earth’s crust where slabs of rock slip past each other

Down 1. stress that stretches rock so that it becomes thinner in the middle 2. point beneath Earth’s surface where rock breaks under stress and causes an earthquake 3. bend in rock that forms where part of Earth’s crust is compressed 5. a vibration that travels through Earth carrying the energy released during an earthquake 6. a type of fault where the hanging wall slides upward 7. type of fault where rocks on either side move past each other sideways with little up-or-down motion 11. scale that rates seismic waves as measured by a particular type of mechanical seismograph 13. a type of seismic wave that forms when P waves and S waves reach Earth’s surface 14. type of fault where the hanging wall slides downward; caused by tension in the crust 15. a downward fold in rock formed by compression in Earth’s crust 17. block of rock that forms the lower half of a fault 18. an earthquake that occurs after a larger earthquake in the same area 19. the point on Earth’s surface directly above an earthquake’s focus 20. type of seismic wave that compresses and expands the ground 22. a break in Earth’s crust where slabs of rock slip past each other 23. large area of flat land elevated high above sea level