science choice board vocab 2

3. current Any movement in matter that results from differences in density; may be vertical, circular, or cyclical.
4. rebound The sudden return of elastically deformed rock to its undeformed shape.
6. The solid outer layer of earth that consists of the crust and the rigid upper part of the mantle.
8. reversal The process by which earth's magnetic north pole and magnetic south pole switch positions periodically;a change in direction which earth magnetic field points.
11. The process by which one lithospheric plate moves beneath as a result of tectonic forces.
16. A break in a body of rock along which one block moves relative to another.
17. The point of earth's surface directly above an earthquake's starting point, or focus.
18. plate A block of lithosphere that consists of crust and rigid.
20. The soft layer of the mantle on which the tectonic plates move.
21. A movement or trembling of the ground that is caused by a sudden release of energy when rocks along a fault move.
23. The location within earth along a fault at which the first motion of a earthquake is formed.
24. A system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation.

1. drift The hypothesis that a single large landmass broke up into smaller land masses to form continents, which then drifted to their present locations; the movement of continents.
2. The central part of earth below the mantle.
5. boundary The boundary between tectonic plates that are colliding.
7. boundary The boundary between 2 tectonic plates that are sliding past each other horizontally.
9. The layer or rock between the earth crust and core.
10. boundary The boundary of 2 tectonic plates that are moving away from each other.
12. The bending tilting and breaking of earth's crust.
13. The thin and solid outermost layer or earth above the mantle.
14. The strong lower part of the mantle between the asthenosphere and the outer core.
15. plate boundary The edge between two or more plates classified as divergent, convergent, or transform by the movement taking place between the plates.
19. spreading 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.
22. tectonics The theory that the earth's outer layer is made up 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.