Sites updated Jan. 2016
Wikipedia simple This is a good article to start with as it is the easiest to read and gives you a quick idea of what Niagara Falls is about.
Wikipedia This is like the above website with much more detail.
Canadian Encyclopedia <<< various articles on Niagara Falls River and history. All of the information is reliable.
Info about whether Niagara Falls could erode away, (near the end of the article) http://www.niagaraparks.com/about-niagara-falls/geology-facts-figures.html
NEW on Jan. 31/15 Canadian Man Climbs Ice on Niagara Falls! <<< With video too!
YouTube <<< various clips – some have lots of value and some have little
Things to do in NFalls.