Mono Lake, east of Yosemite National Park in California, has several areas where you can see these large formations, known as tufa towers. These towers form when calcium rich spring-water bubbles up into the waters of Mono Lake, which is saturated with carbonates, causing the calcium to combine chemically to create calcium carbonate. This calcium carbonate then precipitates out and settles around the underwater springs which, over time, forms these limestone towers. Over the last 80 years or so, due to increasing use of water for agriculture and the ever growing cities in Nevada and California, the lake level has been dropping, exposing these fascinating formations for everyone to see...
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