leeds cricket ground Archives - ToursMaps.com ® http://toursmaps.com/tag/leeds-cricket-ground Fri, 17 Jun 2016 14:11:12 +0000 en-US hourly 1 https://wordpress.org/?v=6.0.9 Black Water and Travertine Yellowstone http://toursmaps.com/black-water-travertine-yellowstone.html http://toursmaps.com/black-water-travertine-yellowstone.html#respond Sat, 18 Jun 2016 02:40:00 +0000 http://toursmaps.com/?p=206921 Why are Firehole Lake and some of the nearby springs black? There are large amounts of manganese oxide being deposited, more than anywhere else in the park. In fact, George Henderson, tour guide in the 1880s and ’90s, liked to call this part of the Firehole River valley Ebony Basin. Around Firehole Lake, the mineral travertine, which is calcium carbonate in the form deposited by hot springs, is deposited along with geyserite (silicon dioxide). This is unusual, because in all but four of the park’s thermal areas, the geysers and hot springs deposit only geyserite. At Mammoth Hot Springs, the

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