A break or crack in Earth's lithosphere along which the rocks move.

A deep valley along the ocean floor through which oceanic crust slowly sinks toward the mantle.

A deep valley that forms where two plates move apart.

A dense sphere of solid iron and nickel in the center of Earth.

A layer of molten iron and nickel that surrounds the inner core of Earth.

A rigid layer made up of the uppermost part of the mantle and the crust. One of four spheres into which scientists divide Earth.

A section of the lithosphere that slowly moves over the asthenosphere, carrying pieces of continental and oceanic crust.

A system that determines the distance of an object under water by recording echoes of sound waves; gets its name from sound navigation and ranging.

A vibration that travels through Earth carrying the energy released during an earthquake.

Inner core

Manle

Pressure

Seismic Waves

Subduction

The amount of force pushing on a surface or area.

The amount of mass in a given space; mass per unit volume.

The direct transfer of energy through empty space by electromagnetic waves.

The hypothesis that the continents slowly move across Earth's surface.

The layer of hot, solid material between Earth's crust and core.

The layer of rock that forms Earth's outer surface.

The movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another.

The movement of energy from a warmer object to a cooler object.

The name of the single landmass that broke apart 225 million years ago and gave rise to today's continents.

The preserved remains or traces of living things.

The process by which molten material adds new oceanic crust to the ocean floor.

The process by which oceanic crust sinks beneath a deep-ocean trench and back into the mantle at a convergent plate boundary.

The soft layer of the mantle on which the lithosphere floats.

The theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle.

The transfer of heat by movements of a fluid.

The transfer of heat from one substance to another by direct contact of particles of matter.

The under sea mountain chain where new ocean floor is produced; a divergent plate boundary.

boundary-A plate boundary where two plates move away from each other.

boundary-A plate boundary where two plates move past each other in opposite directions.

boundary-A plate boundary where two plates move toward each other.

conduction

continental

drift

convection

convection currents

convergent

crust

deep ocean trench

density

divergent

fault

fossil

heat transfer

lithoshere

mid ocean ridge

outer core

pangaea

plate

plate tectonics

radiation

rift valley

sea floor spreading

sonar

transform