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St. Paddy's Day Question


RiverRuns

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http://www.niagaraparks.com/media/geology-facts-figures.html

Why is the water so green?

The startling green colour of the Niagara River is a visible tribute to the erosive power of water. An estimated 60 tons of dissolved minerals are swept over Niagara Falls every minute. The colour comes from the dissolved salts and "rock flour," very finely ground rock, picked up primarily from the limestone bed but probably also from the shales and sandstones under the limestone cap at the falls.

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