The hypothesis that the continents slowly move across Earth's surface. Proposed originally by Alfred Wegener in the early 1900s.
The transfer of heat by movement of a fluid.
The density of a fluid changes when it is heated or cooled. Due to gravity, the more dense fluids sink and the less dense fluids rise, causing the fluids to move in a circular motion.
A trace of an ancient organism that has been protected in a rock.
A possible explanation for something, made using evidence.
The name of the single land mass that broke apart into the continents as we know them today. Greek for "all lands."
A part of the lithosphere that slowly moves over the athenosphere while carrying parts of continental and oceanic crust.
The theory that the pieces of Earth's lithosphere are always moving (slowly) because of convection currents in the mantle.
An explanation for an idea that is supported by facts and information. Not proven to be conclusively true, but believed to be true due to support from facts.