Of course it is, but you don't have to take my word for it; just consider the evidence:
FACT: Ferdinand Magellan, the first man to attempt the circumnavigation of the Earth, sailed from Spain in 1519 and was never seen again.
FACT: If you try to wrap a paper map around a sphere, you have to distort the shape of the continents to make it fit.
FACT: You know who else said the Earth was round? Hitler, that's who.
Wake up, sheeple!
Ah, but waves are not flat now are they, and Magellan had to sail quite a few of those did he not?