Uh... yes to all?

[This is not Sokka's best subject, and that's very apparent in the way he speaks- but he muddles through as best he can.]

So our world is like...split into two? A human world and a spirit world. They kind of...exist on top of one another- sometimes, Spirits can cross over into our world, they effect all stuff from nature to the elements and well...all things. Like there's forest spirits, and swamp spirits- a moon spirit... that kind of thing.