Grand Prismatic Spring (HD) скачать в хорошем качестве

Grand Prismatic Spring (HD)

-------------------------- Grand Prismatic Spring Hot springs are sites where groundwater emerges at the Earth’s surface (or on the seafloor). Hot spring water has to be higher in temperature than the human body (an admittedly arbitrary definition): above 98° Fahrenheit (= above 37° Celsius). Geysers are hot springs that episodically erupt columns of water. The highest concentration of geysers and hot springs anywhere is in Yellowstone’s Upper Geyser Basin (northwestern Wyoming, USA). Grand Prismatic Spring is the largest, most colorful hot spring in Yellowstone. The center of the pool has hot blue water, colored by a relative abundance of microscopic colloidal silica. Surrounding the blue are halos of green, yellow, orange, reddish, and brown. The latter four colors are from the presence of microbial mats. Microbes that thrive in extreme conditions are called extremophiles. Phormidium, Synechoccus, and Calothrix cyanobacteria have been identified in Grand Prismatic Spring’s runoff channels. A water sample taken in 1998 had a pH of 8.3 - this is a slightly alkaline spring. Filmed from the boardwalk & Midway Bluff & Picture Hill (the latter two from before park closures). Clips 1-5 - Grand Prismatic Spring in the afternoon of 5 July 2012. Clip 6 - Grand Prismatic Spring in the late afternoon of 5 August 2013. Clips 7-12 - Grand Prismatic Spring in the late morning of 9 July 2014. Still photos at end - taken in boreal summers of 2011 and 2013. ----------------------------