Understanding what a "year" is is pretty basic (how else can one interpret the fact that people don't know how long it takes the earth to go around the sun?). I wouldn't put that in the 'trivia' category.
Knowing the land to water ratio is marginally more trivia-like; I think the range they accepted as 'reasonably right' is a tad too narrow--but not by much. Anyone who's ever seen a map should be able to know it's well over 50%, but that there's still quite a lot of land -- at which point 70% would be pretty easy to guesstimate. Of course this reqiures (1) having seen (and understood to some extent) the map of the world, and (2) knowing what "percent" means. Sadly, too many people in the US would have trouble with at least one of these.