Perhaps we're on the equator?

As a kid, in class, when we were just learning this, I seriously thought that there was supposed to be a dotted line. Then the teacher ruined it all.

The part that bugs me is that "because" is supposed to be one word

this show is the best

In history we were discussing geography and oceans. My teacher said in a different class period a kid asked why the oceans have different names if they're all one ocean. She told him that they're not one ocean and they have glass walls separating the oceans. Another kid piped up and said "yeah so if a shark tries to cross into a different ocean it'd just hit the glass." He believed it.