Hi, Gest! I think the problem lies in the grammar in the song, which is on the grade three level.

The song-
"Great archipelago(e)s too, and all these
Are covered with little green islands."

Suggested revision-
Great archipelagos too, and in these
Are scattered little green islands.

This is better (I think).
I agree that the song needs a rewrite.
"All o'er the globe some circles are found..." Can't you just see them? "Some go from north to southern bound...??

No, not written by Ms Primandproper, but by one of her more 'challenged' pupils.