That's true: the continents are still moving. The notion of the continental drift might be explained as the slow movement of the relative continents across the sea-floor.

The first attempts to prove the theory were made in the latter half of the 16 th century. But the science of that time wasn't developed enough to get some evidence of the existence of this curious phenomenon. More than 300 years had passed before the theory was finally accepted. The concept was fully developed only in the 20th century. Nevertheless, scientists had been taking this theory with a grain of salt until the idea was finally subsumed to the theory of plate tectonics.

Nowadays there is no doubt that continents are constantly drifting along the ocean bed (two inches per year).