Old coins should be disposed of properly, as in piggy banks and coin collections. Here's what can happen when too many tourists
toss coins into an otherwise pristine natural resource. -Editor
 Yellowstone National Park's Morning Glory thermal spring used to be deep blue but its current
yellow and green hues were caused in part by tourists throwing coins, rocks, and assorted crap into the pool. The detritus has the effect of
"partially blocking the underground heat source and lowering the temperature of the spring to a range habitable by photosynthetic microorganisms
that probably didn’t live there before" and produce pigments that result in the yellow and green color, according to a Science Friday article.
The image at right is from 1966
To read the complete article, see:
People throwing pennies changed the color of a Yellowstone hot
spring (http://boingboing.net/2015/02/06/people-throwing-pennies-change.html)
To read the original Science Friday article, see:
Picture of the Week: Yellowstone’s Morning
Glory (http://sciencefriday.com/blogs/02/04/2015/picture-of-the-week-yellowstone-s-morning-glory.html)
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Wayne Homren, Editor
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