the theory states that Earth's plates are in slow, constant motion, riven by convection currents in the mantle

a well-tested explanation for a wide range of observations or experimental results

facts or data used to support a claim

the idea that Earth's continents move slowly over the surface

the supercontinent that existed 300 million years ago

a piece of the lithosphere that moves around on top of the asthenosphere

the relatively thin, but dense part of the earth's crust that the ocean sits on top of

the relatively thick part of the earth's crust that forms the large landmasses

a place where two tectonic plates slide past one another

a place where two tectonic plates come together

a place where two tectonic plates move away from each other