Even atheistic scientists admit that Niagara Falls is less than 15,000 years old, which makes it a Counterexample to an Old Earth
According to Encyclopedia Britannica, "[w]ithin a river’s time scale, a waterfall is a temporary feature that is eventually worn away". Indeed, according to https://www.niagaraparks.com/visit-niagara-parks/plan-your-visit/niagara-falls-geology-facts-figures/ "50,000 years from now, at the present rate of erosion, the remaining 20 miles to Lake Erie will have been undermined. There won’t be a falls anymore, but there will still be a river at work." This seems to be a typical timeline for a waterfall. --AugustO (talk) 17:23, 8 January 2018 (EST)