Across
- 4. The point on Earths surface directly above an earthquakes starting point, or focus
- 7. A break in a body of rock along which one block moves relative to another
- 11. The theory that Earth's outer layer is made up of large, moving pieces called tectonic plates; the theory explains how processes such as earthquakes and mountain building
- 13. The process by which Earth's magnetic north pole and magnetic south pole switch positions periodically; a change in the direction in which Earth's magnetic field points
- 16. Any movement of matter that results from differences in density; may be vertical, circular, or cyclical
- 19. The hypothesis that a single large landmass broke up into smaller landmasses to form continents
- 21. The boundary between two tectonic plates that are moving away from each other
- 22. The soft layer of the mantle on which the tectonic plates move
- 23. The layer of rock between the Earth's crust and core
- 24. The process by which new oceanic lithosphere forms when magma rises to Earth's surface at mid-ocean ridges and solidifies, as older, existing sea floor moves away from the ridge
Down
- 1. The solid, outer layer of Earth that consists of the crust and the rigid upper part of the mantle
- 2. The strong, lower part of the mantle between the asthenosphere and the outer core
- 3. The bending, tilting, and breaking of the Earth's crust; the change in shape of rock in response to stress
- 5. A block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
- 6. A movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move
- 8. The edge between two or more plates classified as divergent, convergent, or transform by the movement taking place between the plates
- 9. The location within Earth along a fault at which the first motion of an earthquake appears
- 10. The sudden return of elastically deformed rock to its undeformed shape
- 12. The boundary between tectonic plates that are sliding past each other horizontally
- 14. The boundary between tectonic plates that are colliding
- 15. The process by which one lithosphere plate moved beneath another plate as a result of tectonic forces
- 17. The thin and solid outermost layer of Earth
- 18. a system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation
- 20. The central part of Earth below the mantle