Knowledge: The Grand Canyon, an iconic American landmark, has been around for millions of years shaped by natural forces while Niagara falls was formed around 12,000 years ago at the end of the last ice age.

Conversation:
My moms family lives in upstate New York, when I was a kid I got to walk over to the Canadian side and had the most beautiful view of Niagara Falls. Only went once but I remember it like it was yesterday. Do you know anything about it or have you seen it?
I know that it is the collective name for three waterfalls that straddle the international border between Canada and the United States.
I remember a bunch of people used to try to go down it in barrels, talk about an intense way to die. Sorry, did I just get morbid with this? Anyway, it's huge!
From largest to smallest, the three waterfalls are the Horseshoe Falls, the American Falls and the Bridal Veil Falls
That's really interesting. How long has it been around for?

Response: Niagara falls was created over 12,000 years ago at the end of the last ice age