Unit 7 The Dynamic Earth

4. Located between the core and the crust
7. Ground movements that occur when blocks of rock in Earth move suddenly and release energy
10. The return of rock to its original shape after elastic deformation
11. The crack that forms between the two blocks
12. Where two or more tectonic plates meet
15. Directly above the focus on Earth’s surface is the ______.
18. Extends from below the mantle to the center of Earth
19. A boundary at which two plates move past each other horizontally
21. Stress that squeezes or pushes rock together
26. Magma that has reached Earth’s surface
27. Layer of weak or soft mantle that is made of rock that flows slowly
28. Place within Earth along a fault at which the first motion of an earthquake occurs
29. The strong, lower part of the mantle

1. Melted rock
2. Opening of a volcano
3. Each piece of the lithosphere is called a ______.
5. The process by which rocks change shape when under stress
6. Occurs as molten rock within Earth rises through cracks along a mid-ocean ridge
8. Any place where gas, ash, or melted rock come out of the ground
9. Theory that states that Earth’s outer layer is broken into large, slowly moving pieces
13. Form where two plates collide
14. Two plates move away from each other
16. About 200–300 million years ago, the continents were joined in a single large landmass called ______.
17. The outermost solid layer of Earth
20. Location where a column of extremely hot mantle rock rises through the asthenosphere
21. The movement of matter that results from differences in density caused by variations in temperature
22. Occurs when rock layers bend under stress
23. Stress that pushes rocks in parallel but opposite directions
24. Stress that stretches or pulls rock apart
25. The outermost, rigid layer of Earth