By sam garza from Los Angeles, USA – mono lake serenity, CC BY 2.0, Link
Mono Lake Tufa State Natural Reserve is located near Yosemite National Park within Mono County, in eastern California. The lack of an outlet to the ocean causes high levels of salts to accumulate in the lake. Many columns of limestone rise above the surface of Mono Lake. These limestone towers consist primarily of calcium carbonate minerals. This type of limestone rock is referred to as tufa, which is a term used for limestone that forms in low to moderate temperatures. The tufa originally formed at the bottom of the lake. It took many decades or even centuries to form the well-recognized tufa towers. When lake levels fell, the tufa towers came to rise above the water surface and stand as the majestic pillars seen today.
By Yukinobu Zengame from Cupertino, United States – South TufaUploaded by Adrignola, CC BY 2.0, Link
By Ron Reiring – Mono Lake, CAUploaded by X-Weinzar, CC BY 2.0, Link
By Vezoy (talk · contribs) – Own work, CC BY-SA 3.0, Link
By King of Hearts / Wikimedia Commons / CC-BY-SA-3.0, CC BY-SA 3.0, Link
By Matt Frederick from USA – Flickr, CC BY 2.0, Link
By Supercarwaar – Own work, CC BY-SA 4.0, Link
By James J. Ludemann, CC BY 3.0, Link
By Brian W. Schaller – Own work, FAL, Link
By Brocken Inaglory, CC BY-SA 3.0, Link
e MORFES 
La natura non finisce mai di stupirci con le sue particolari immagini
Un saluto,silvia