If you look at a globe of the Earth, it appears that the continents could be pushed together into one land mass, much like pieces of a jigsaw puzzle. This got folks thinking that perhaps the continents were together at one point in Earth's history. After core samples were taken and compared across continents, they learned that the data across the oceans matched.
There were then two questions: What caused the one large continent (now called Pangaea) to break apart in the first place? Also, how fast did the continents move apart from one another?
