What Parts of speech is over in The balloon floated the treetops?

Let's break down the parts of speech in the sentence "The balloon floated over the treetops":

* The: This is a definite article, specifying a particular balloon.

* balloon: This is a noun, the subject of the sentence.

* floated: This is a verb, indicating the action of the balloon.

* over: This is a preposition, showing the relationship between the balloon and the treetops.

* the: This is another definite article, specifying the particular treetops.

* treetops: This is a noun, the object of the preposition "over."

Therefore, "over" in the sentence is a preposition.