Across
- 3. Convection current is any movement of matter that results from differences in density; may be vertical,circular, or cyclical
- 5. Tectonic plates are a block of lithosphere that consists of the crust and the rigid, outermost part of the mantle
- 6. The lithosphere is the solid, outer layer, of earth that consists of the crust and the rigid upper part of the mantle
- 8. Plate tectonics is the theory that earth's outer layer is made of large; moving pieces called tectonic plates; the theory explains how plates interact and how those interactions relate to processes such as earthquakes and mountain building
- 11. The magnetic reversal is 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.
- 13. The epicenter is the point on earth’s surface directly above an earthquake’s starting point, or focus
- 14. The mesosphere is the strong, lower part of the mantle between the asthenosphere and the outer core
- 16. Convergent boundary is the boundary between tectonic plates that are colliding
- 17. The mantle is the layer of rock between the earth's crust and core
- 20. the crust is the thin and solid outermost layer on earth above the mantle
- 22. Elastic rebound is the sudden return of elastically deformed rock to its undeformed shape
- 23. Deformation is the bending, tilting, and breaking of earth’s crust; the change in the shape of rock in response to stress
Down
- 1. The asthenosphere is the soft layer of the mantle on which the tectonic plates move
- 2. Fault is the break in a body of rock along which one block moves relative to another
- 4. Tectonic plate boundary is the edge between two or more plates classified as divergent, convergent, or transform by the movement taking place between the plates
- 7. The continental drift is the hypothesis that a single large landmass broke up into smaller landmasses to form the continents, which then drifted to their present locations; the movement of continents
- 9. The core is the central part of the earth below the mantle
- 10. A theory is a system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation
- 12. A focus is the location within earth along a fault at which the first motion of an earthquake occurs
- 15. Sea-floor spreading is the process by which new oceanic lithosphere forms when magma rises to earth's surface at mid-ocean ridges and solidifies, as older, existing seafloor moves away from the ridge
- 18. Divergent boundary is the boundary between two tectonic plates that are moving away from each other
- 19. Transform boundary is the boundary between tectonic plates sliding past each other horizontally
- 21. Subduction is the process by which one lithospheric plate moves beneath another plate as a result of tectonic forces
- 22. An earthquake is the movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move