Goreme Valley, Cappadocia, central Anatolia, Turkey, Asia Minor, Asia

Clay statues of Hindu gods and goddesses, Kumartulli district, Kolkata (Calcutta), West Bengal, India, Asia

Agriculture on red clay soil, on the island of Ibiza, Balearic Islands, Spain, Mediterranean, Europe

Gray clay flats below Anvil Hill west of Hamilili Point in Petrified Forest National Park, Arizona, United States of America, North America

A remote Ksar (fortified granary), Tataouine region, southern Tunisian desert

A small hill of gray bentonite clay that appears to be melting into the purple bentonite of Hamilili Valley on the south end of Petrified Forest National Park, Arizona, United States of America, North America

Hills of blood red bentonite clay below Kachina Point in Petrified Forest National Park, Arizona, United States of America, North America

Blood red ridges of Bentonite clay on the east side of Tiponi Point in Petrified Forest National Park, Arizona, United States of America, North America

Red-and-green Macaws (Ara chloropterus) at clay lick, Manu National Park, Peruvian Amazon, Peru, South America

Hills of blood red bentonite clay below Kachina Point in Petrified Forest National Park, Arizona, United States of America, North America

The red water of Lithodendron Wash, red from bentonite clay, in Petrified Forest National Park, Arizona, United States of America, North America

The red water of Lithodendron Wash, red from bentonite clay, in Petrified Forest National Park, Arizona, United States of America, North America

The red water of Lithodendron Wash, red from bentonite clay, in Petrified Forest National Park, Arizona, United States of America, North America

Young Hamar woman with red clay in her hair and with scars and marks of being whipped on her back, Omo River Valley, Ethiopia, Africa

Clay pots and bowls on floor

organic cosmetics. Red clay.

organic cosmetics. Red, green and white clay.

Coloured roosters of clay, Barcelos, Braga, C·vado, Portugal

Two Indian women wearing red saris carrying water filled jugs on their heads through a village, Thar Desert, Rajasthan, India, Asia

Cracks in red soil, Lausitz, Germany

Four-wheel drive vehicle parked under sun shade in front of a small clay house, Licancabur Volcano in background, San Pedro de Atacama, Chile, South America

Fallen leaf of a chumbo in heart shape on clay soil, heart of nature, natural heart, heart shape, symbol of love, sign of love, love symbol, proof of love, heart symbol, organ heart, kindness, affection, inflamed, in love, crush, colour red, heart emoji, Spain, Europe

Teenager manufacturing bricks, Analakely village, Tanambao commune, Tsiroanomandidy district, Bongolava region, Madagascar, Africa

Single pithoi, clay vessel, red rectangular column, stone wall, stone ashlar, Palace of Knossos, Heraklion, Central Crete, Island of Crete, Greece, Europe

View of the City of Venice with the Campanile di San Marco (St Mark's Campanile) and St Mark's Basilica (Basilica di San Marco) standing out among the red clay rooftops, Venice, Veneto, Italy

Terracotta tiled roof of a building and a view of the Adriatic Sea, Trieste, Friuli Venezia Giulia, Italy

Terracotta tiled roof of a building and a view of the Adriatic Sea, Trieste, Friuli Venezia Giulia, Italy

Woman wearing red apron standing in her ceramics workshop, working on clay bowl, England

High angle close up of ceramic artist sitting next to outdoor smoke fire pit, working on vase, England

Woman wearing red apron sitting in her ceramics workshop, working on small clay bowl, England

High angle close up of ceramic artist wearing red apron sitting in her workshop, working on clay vase, England

summer storm over cathedral rock at Red Rock Crossing near Sedona Arizona USA

Clay loaded with iron oxides and dried out, Rio Tinto, Andalusia, Spain *** Local Caption *** R?o Tinto ("Red River") is very acidic (Ph 2) and has a deep reddish hue due to iron dissolved in water. The acidity of the watercourse is linked to the drainage of pyrite, which is very present in the subsoil. Extremophilic and endemic bacteria and algae colonize the river bed, forming a fragile biofilm that evokes the hot springs of Yellowstone Park in the USA.