L2

2. Any movement of matter that results from differences in density; may be vertical, circular, or cyclical
4. The process by which new oceanic lithosphere (sea floor) forms when magma rises to Earth's surface at mid-ocean ridges and solidifies, as older, existing sea floor moves away from the ridges
5. A process by which one lithospheric plate moves beneath another plate as a result of tectonic forces
6. 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

1. 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
3. The theory that Earth's outer layer is made up of large, moving pieces called tectonics plates; the theory explains how plates interact and how those interactions relate to processes such as mountains buildings and earthquakes