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Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Devil's Thumb, Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North  America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Tufa spires and tower formations of calcium carbonate at sunset, Mono Lake, South Tufa Reserve, Mono Basin Scenic Area, Lee Vining, Inyo National Forest Scenic Area, California, United States of America, North America
Mammoth Hot Springs, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Settlement under calcium carbonate mine at Barz, near Abyaneh, Iran, Middle East
Tufa spires and tower formations of calcium carbonate at sunset, Mono Lake, South Tufa Reserve, Mono Basin Scenic Area, Lee Vining, Inyo National Forest Scenic Area, California, United States of America, North America
A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.
Detail of an encrusting sponge growing on a coral reef in Komodo National Park, Indonesia.
A beautiful and healthy coral reef grows in Komodo National Park, Indonesia.
A broadclub cuttlefish (Sepia latimanus) hovers above a beautiful coral reef in Komodo National Park, Indonesia.
A healthy and colorful coral reef thrives among the scenic islands of Raja Ampat, Indonesia.
Detail of a sponge growing on a reef in Lembeh Strait, Indonesia.
Tufas (calcium carbonate), Mono Lake, Tufa State Reserve, California, USA, North America
Tufa spires and tower formations of calcium carbonate at sunset, Mono Lake, South Tufa Reserve, Mono Basin Scenic Area, Lee Vining, Inyo National Forest Scenic Area, California, United States of America, North America
Tufas of calcium carbonate, Mono Lake State Reserve, California, USA
Tufas of calcium carbonate at lake in Mono Lake Tufa State Reserve, with mountains in the background, in California, United States of America, North America
Tufas of calcium carbonate surround lake in Mono Lake Tufa State Reserve, with snow capped mountains in the background, in California, United States of America, North America
Tufa spires and tower formations of calcium carbonate, Mono Lake, South Tufa Reserve, Mono Basin Scenic Area, Lee Vining, Inyo National Forest Scenic Area, California, United States of America, North America
Tufas of calcium carbonate, Mono Lake State Reserve, California, USA
Calcium carbonate tufas, Mono Lake, California, USA, North America
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Thrombolites, a variey of microbialite or living rock that produce oxygen and deposit calcium carbonate, similar to some of the earliest fossil forms of life found on Earth, Lake Clifton, Yalgorup National Park, Mandurah, Western Australia, Australia, Pacific
Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Stromatolites, one of the most ancient life forms on earth, mats of micro-organisms that become rock-like structures through accretion of calcium carbonate, in highly saline lagoons like here in Lake Thetis, Cervantes, Dandaragan Shire, Western Australia, Australia, Pacific
Close-up of the limestone terraces formed by volcanic water depositing six inches of calcium carbonate a year, Mammoth Hot Springs and Terraces, Yellowstone National Park, UNESCO World Heritage Site, Wyoming, United States of America, North America
Pillar, geological calcareous formation on the wall of Anhumas Abyss, Bonito, Mato Grosso do Sul, Brazil, South America
Cone forest inside the lake, Anhumas Abyss, Bonito, Mato Grosso do Sul, Brazil
Pamukkale travetine terrace, white calcium carbonate rock formations, Turkey
Pamukkale travetine terrace, white calcium carbonate rock formations, Turkey
Pamukkale travetine terrace, white calcium carbonate rock formations, at sunset, Turkey
Mammoth Hot Springs with bare tree trunk in Yellowstone National Park, Wyoming.
The Trona Pinnacles are pictured on a hot summer day in Trona, Calif., on June 7, 2015. The unique formations, known as tufa towers, are primarily made of calcium carbonate and were formed when the springs interacted with the water in what was once Searles Lake.
Hot Springs And Travertines, Terraces Of Carbonate Minerals Left By The Flowing Water, Pamukkale, Turkey
Hot Springs And Travertines, Terraces Of Carbonate Minerals Left By The Flowing Water, Pamukkale, Turkey
Hot Springs And Travertines, Terraces Of Carbonate Minerals Left By The Flowing Water, Pamukkale, Turkey
The Guildhall, Bath, Somerset, England
Hot Springs And Travertines, Terraces Of Carbonate Minerals Left By The Flowing Water, Pamukkale, Turkey
Grota Town with the traditional white houses and a view of the Aegean Sea; Grota, Naxos Island, Cyclades, Greece
This red encrusting sponge (Clathria sp.) is the most common of this family found in Hawaii. Here it has covered the calcium carbonate-producing seaweed, Halimeda kanaloana, Hawaii, United States of America