Earth

2. the body of molten rock that feeds a volcano.
6. a volcanically active area of Earth’s surface for from a tectonic plate boundary.
7. stress that occurs when forces act to squeeze an object.
8. the strong lower part of the mantle.
11. Waves a wave of energy that travels through Earth away from an earthquake.
12. the layer of rock in the Earth.
13. the point along a fault at which the first motion of an earthquake occurs.
15. the boundary formed by the collision of two tectonic plates.
18. an opening at the surface of the Earth through which volcanic material passes.
20. a vent of fissure in the Earth’s surface through which magma and gases are expelled.
21. the theory that explains how plates move and change shapes.
24. stress that occurs when forces act to stretch an object.
26. the process by which new land is formed.
27. the boundary between tectonic plates that are sliding past each other.
28. the hypothesis that states the continents once formed a single land mass but drifted to present day location.

1. an area of deep cracks that forms between two tectonic plates that are pulling away from each other.
3. the soft of the mantle where plates move.
4. the central part of Earth.
5. a block of lithosphere that consist of crust and the ridge.
7. a funnel-shaped pit near the top of the central air vent of a volcano.
9. the point on Earth’s surface directly above an Earthquake’s starting point.
10. the rising of regions of the Earth’s crust to higher elevations.
14. the boundary created by plates spreading apart.
15. a large, semicircular depression that forms when magma chamber below a volcano partially empties and causes the ground above to sink.
16. a seismic wave that causes particles of rock to move back-and-forth.
17. the solid layer that consist of crust and the upper mantle.
19. a seismic wave that cause particles of rock to move side-to-side.
22. the study of earthquakes.
23. bending of rock layers due to stress.
25. the thin solid outermost layer of Earth.
29. a break in a body of rock along which one block slides relative to another.