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The Colored Pebbles of Lake McDonald

Dragon
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Post by Dragon Sat Jul 21, 2018 6:16 pm

The Glacier National Park in the U.S. state of Montana, on the border with Canada, is home to more than 700 lakes, although only 131 of these lakes have names. Approximately 200 lakes are over five acres in size, and a dozen of them exceeds thousands of acres, which in unusual for mountain lakes. Additionally, the waters of the lakes are remarkably clear. This is owning to the year long low temperatures that prohibit the growth of planktons. It is not unusual to see details on the bottom of the lakes at depths of 30 feet or more.

One of the most striking feature of some of these lakes is the presence of a variety of colored rocks and pebbles just below the water surface and on the shores. The rocks range in color from dark red to maroon, and from green to blue. Colored pebbles are seen in abundance on the shores of Lake McDonald on the western side of the park. Lake McDonald is the largest of the lakes of Glacier National Park with a surface area of 6,823 acres. It is also the longest, at over 15 km, as well as the deepest lake at 141 meters.

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Post by Cloud Sat Jul 21, 2018 6:42 pm

That's the most beautiful lake I've ever seen

Dragon wrote: It is not unusual to see details on the bottom of the lakes at depths of 30 feet or more.

The color of the rocks is determined by the presence or absence of iron. The bright red rocks found along the Grinnel Glacier trail were deposited in a shallow ocean environment where the iron was oxidized by the tidal exposure to the air. Rocks with this coloration often have old ripple marks or ancient mud crack lines.

The rich green-colored rocks were formed in deeper water than the red rocks. Although these rocks contain the same quantities of iron-bearing minerals, they did not have the same exposure to oxygen and the amount of oxidization was limited.


Good to know why this is, I guessed it might be to do with minerals

:goodpost: :goodposting: hugs2


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Post by astraldreamer Sat Jul 21, 2018 7:56 pm

just looked at the picture, its truly beautiful :)
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Post by Dragon Sat Jul 21, 2018 8:09 pm

The Colored Pebbles of Lake McDonald Lake-mcdonald-colored-pebbles-510
Photo credit: Jinrui Qu/Flickr

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Post by astraldreamer Sat Jul 21, 2018 8:11 pm

I love it
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Post by Dragon Sat Jul 21, 2018 8:14 pm



Lake McDonald at Glacier National Park, Montana


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Post by Dragon Sat Jul 21, 2018 8:16 pm



Lake McDonald Fish


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