Niagara Falls is not associated with a plate boundary. It is formed by the erosion of the Niagara Escarpment, a geological formation created by the glacial activity during the last Ice Age.

Here's how it works:

* Glacial erosion: The massive glaciers that covered North America during the Pleistocene epoch carved out the Niagara Escarpment.

* Water erosion: As the glaciers retreated, the Niagara River flowed over the escarpment, gradually eroding the softer rock layers at the top. This created the dramatic waterfall we see today.

So, while Niagara Falls is a spectacular example of natural forces shaping the landscape, it's not related to the movement of tectonic plates.