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This photo was taken under Painel do Pilão, a rock art site near Monte Alegre, along the Amazon River in Brazil. The image is a 22° sun halo that is formed when sunlight is refracted by ice crystals in the Earth’s upper ...
Touched the Sky
I study rock art paintings, some of which are 13,000 years old, near the city of Monte Alegre along the Amazon River in Brazil. There, the ancient artists made pigments from natural earth minerals (ochre) probably mixed ...