A section of the lithosphere that slowly moves over the asthenoshpere, carrying pieces of continental and oceanic crust
a theory that explains scientific observations
the theory that pieces of Earth's lithosphere are in constant motion, driven by convection currents in the mantle
a crack in the earth's crust resulting from the displacement of one side with respect to the other
A plate boundary where two plates move away from eachother.
A deep valley that forms where two plates move apart.
a plate boundary where two plates move toward each other
a plate boundary where two plates move past each other in opposite directions
An underwater moutain chain where new ocean floor is formed
A device that determines the distance of an object under water by recording echoes of sound waves.
the process by which molten material adds new oceanic crust to the ocean floor.
A deep valley along the ocean floor beneath which oceanic crust slowly sinks toward the mantle.
A trace of an ancient organism that has been preserved in rock.
a geological process in which one edge of a crustal plate is forced sideways and downward into the mantle below another plate.
The hypothesis that the continents slowly move across earths surface.
The name of the single landmass that broke apart 200 million years ago and gave rise to todays continents.