Earths interior

2. tectonics The theory that 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.
4. reversal 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.
10. A system of ideas that explains many related observations and is supported by a large body of evidence acquired through scientific investigation
11. current Any movement of matter that results from differences in density; may be vertical, circular, or cyclical.
13. The strong, lower part of the mantle between the asthenosphere and the outer core.
16. Directly above the focus on Earth’s surface is the epicenter.
17. spreading The process by which new oceanic lithosphere form when magma rises to Earth's surface at mid-ocean ridges and solidifies, as older, existing seafloor moves away from the ridge.
20. boundary 2 tectonic plates can move past one other in opposite directions and form a transform boundary.
23. plates The theory of plate tectonics explains how lithospheric plates move around on the slow-flowing rock of the asthenosphere
24. The central part of Earth below the mantle.

1. boundary When tectonic plates move toward each other and collide, a convergent boundary forms.
3. solid layer made of rock.
5. The thin and solid outermost layer of Earth adobe the mantle.
6. Earthquakes are ground movements that occur when blocks of rock in Earth move suddenly and release energy.
7. The layer of rock between the Earth’s crust and core.
8. Deformation is the bending, tilting, and breaking of rock.
9. is a place within Earth along a fault at which the first motion of and earthquake occurs.
12. boundary When 2 tectonic plates move away from one another, or diverge, a divergent boundary forms.
14. A break in a body of rock along which one block moves relative to another.
15. plates boundary A tectonic plates boundary is where 2 or more tectonic plates builds up near the edges of the plates.
18. It is a rigid, solid layer made of rock.
19. rebound The sudden return of elastically deformed rock to its undeformed shape.
21. The process by which one lithospheric plate moves beneath another plate as a result of tectonic forces.
22. drift The hypothesis that a single large landmass broke up into smaller land masses to form the continents, which then drifted to their present locations; the movement of continents.