| A | B |
|---|
| The layer of hot, solid material between Earth's crust and core. | Mantle |
| The layer of rock that forms Earth's outer surface. | Crust |
| Earth's dense center, made up of the solid inner core and the molten outer core. | Core |
| A rigid layer made up of the uppermost part of the mantle and the crust. | Lithosphere |
| The soft layer of the mantle on which the lithosphere floats. | Asthenosphere |
| A layer of molten iron and nickel that surrounds the inner core of Earth. | Outer Core |
| A dense sphere of solid iron and nickel in the center of Earth. | Inner Core |
| The name of the single landmass that broke apart 225 million years ago and gave rise to today's continents. | Pangaea |
| The hypothesis that the continents slowly move cross earth's surface. | Continental Drift |
| The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another. | Convection Currents |
| The direct transfer of energy through empty space by electomagnetic waves. | Radiation |
| The process by which molten material adds new oceanic crusts to the ocean floor. | Sea-Floor Spreading |
| The transfer of heat by movements of a fluid. | Convection |
| The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary. | Subduction |
| The transfer of heat from one substance to another by direct contact of particles of matter. | Conduction |
| The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle. | Plate tectonics |
| A plate boundary where two plates move past each other in opposite directions. | Transform Boundary |
| A plate boundary where two plates move toward each other. | Convergent Boundary |
| A break or crack in Earth's lithosphere along which the rocks move. | Fault |
| A deep valley that forms where two plates move apart. | Rift Valley |
| A plate boundary where two plates move away from each other. | Divergent Boundary |
