Yva Momatiuk & John Eastcott / Minden / Calcium tufa formations, Mono Lake, California
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Yva Momatiuk & John Eastcott / Calcium tufa formations, Mono Lake, California
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Yva Momatiuk & John Eastcott / Minden / Great Horned Owl (Bubo virginianus) pair on calcium tufa formation, Mono Lake, California
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Doug Wechsler / Kidney Stone made of calcium oxalate, Pennsylvania, USA.
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through a pipeline into the ash p...
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Milan Radisics / Aerial view of ash pond near Turek, Poland. Former open pit coal mine now used to store coal ash after burning in power plants. The ash is mixed with water and pumped through pipelines (fixed on sand...
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Nigel Cattlin / Blossom end rot caused by calcium deficiency to ripe tomato glasshouse fruit on the vines, Berkshire, England, UK.
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Nigel Cattlin / Blossom end rot caused by calcium deficiency to ripe tomato glasshouse fruit on the vines, Berkshire, England, UK.
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Nigel Cattlin / Tomato (Solanum lycopersicon) with blossom end rot, symptom of calcium deficiency, cultivated in glasshouse. Berkshire, England, UK. July.
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Claudio Contreras / Hierve el Agua rock formation with calcified minerals, resembling a waterfall. Oaxaca, southern Mexico.
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Ernie Janes / Wolverine (Gulo gulo) licking antler to keep its teeth healthy and for calcium and other nutrients. Captive.
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David Perpinan / Radiography of the anterior section of a captive Leaf-tailed gecko (Uroplatus guentheri) showing cervical endolymphatic calcium stores. These stores are more prominent in females and are used as a cal...
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David Fleetham / Red encrusting sponge (Clathria sp) on calcium carbonate-producing Seaweed / Green algae (Halimeda kanaloana). Hawaii.
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Ashley Cooper / Snails aestivating on a fence post in the Coto Donana, Andalucia, Spain, June 2011
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Floris van Breugel / Tufa towers along Mono Lake, which form as sodium carbonate reacts with calcium rich spring water. Mono Lake, California, USA. June 2017.
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Floris van Breugel / Tufa towers along Mono Lake, which form as sodium carbonate reacts with calcium rich spring water. Mono Lake, California, USA. September.
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Floris van Breugel / Tufa towers along Mono Lake, which form as sodium carbonate reacts with calcium rich spring water. Mono Lake, California, USA. June 2017.
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Floris van Breugel / High speed exposure of a Fruit fly (Drosophila melanogaster) taken through a microscope. In this image flight muscles express a genetically engineered protein called GCaMP, which fluoresces green in t...
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Philippe Clement / Dolomite specimen, anhydrous carbonate mineral composed of calcium magnesium carbonate on white background
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Alex Hyde / Straw or tubular stalactites which are very delicate, hollow structures. They form when calcium carbonate or calcium sulfate dissolved in the water comes out of solution and is deposited in a ring aro...
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Alex Hyde / Close up of straw or tubular Stalactites which are very delicate, hollow structures. They form when calcium carbonate or calcium sulphate dissolved in the water, deposited in a ring around the outsid...
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Alex Hyde / Close up of straw or tubular stalactite, a very delicate, hollow structure. They form when calcium carbonate or calcium sulfate dissolved in the water is deposited in a ring around the outside of each...
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Alex Hyde / Cave Pearls, formed as dripping water rich in calcium salts deposits calcite around a small nucleus (often a sand grain). The constant movement of each cave pearl by the dripping water keeps them roun...
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Alex Hyde / Cave Pearls, formed as dripping water rich in calcium salts deposits calcite around a small nucleus (often a sand grain). The constant movement of each cave pearl by the dripping water keeps them roun...
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Alex Hyde / Cave Pearls, formed as dripping water rich in calcium salts deposits calcite around a small nucleus (often a sand grain). The constant movement of each cave pearl by the dripping water keeps them roun...
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Alex Hyde / Cave Pearls, formed as dripping water rich in calcium salts deposits calcite around a small nucleus (often a sand grain). The constant movement of each cave pearl by the dripping water keeps them roun...
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John Cancalosi / Fluorite, the mineral form of calcium fluoride, backlit specimen, China.
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Steve O. Taylor (GHF) / Tropical house gecko (Hemidactylus mabouia) with cysts of stored calcium in guest house, Ituri Rainforest, Democratic Republic of Africa.
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Philippe Clement / Roe deer (Capreolus capreolus) antler, showing teeth marks where it has been gnawed upon by mice, squirrels and other rodents for Calcium, Magnesium and other minerals, UK
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Philippe Clement / Roe deer (Capreolus capreolus) antler, showing teeth marks where it has been gnawed upon by mice, squirrels and other rodents for Calcium, Magnesium and other minerals, UK
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Philippe Clement / Close-up of the shed antler of a Roe deer (Capreolus capreolus), showing teeth marks where it has been gnawed upon by mice, squirrels and other rodents for Calcium, Magnesium and other minerals, UK
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Philippe Clement / Close-up of the shed antler of a Roe deer (Capreolus capreolus), showing teeth marks where it has been gnawed upon by mice, squirrels and other rodents for Calcium, Magnesium and other minerals, UK
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Yukihiro Fukuda / Japanese squirrel (Sciurus lis) feeding on bone in order to obtain calcium, Mount Yatsugatake, Nagano Prefecture, Japan, May. Endemic species.
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Peter Cairns / Calcified trees at Tangled Creek in winter, Yellowstone National Park, Wyoming, USA, February 2013.
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John Cancalosi / Chalk, calcium carbonate or CaCO3 from Rotting Dean, England, UK.
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Mark Taylor / Calcium carbonate covered plants in hot spring, Yellowstone National Park, Wyoming, USA
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Mark Taylor / Calcium carbonate covered plants in hot spring, Yellowstone National Park, Wyoming, USA
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Jack Dykinga / Dawn at Inspiration Point, with calcium carbonate hoodoo formations glowing, Bryce Canyon National Park, Utah, USA
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Jack Dykinga / Calcium carbinate hoodoos with reflected light of dawn above the conifer lined valley below, Bryce Canyon National Park, Utah, USA
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Erlend Haarberg / Curved layers of marble and calcium-silicate flowing around mica schist from the Engabreen Glacier, Saltfjellet-Svartisen National Park, Nordland, Norway, September 2006
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David Maitland / Cross section through Spine of Sea Urchin (Echinus lividus) shows how its entire structure is made up from a repeating ?uilding-block?pattern of calcium carbonate plates arranged radially in a symmetr...
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Diane McAllister / Northwestern fence lizard / Blue bellied lizard (Sceloporus occidentalis occidentalis) sunning itself on a fencepost. It is molting and will consume the shed skin for calcium and other nutrients. Palo...
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Nick Upton / Close up of porous travertine limestone formed in a waterfall by calcium laden water tumbling over rocks covered with moss and other vegetation at Krka National Park, Croatia, July 2010.