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Kiviõli, Estonia - February 22, 2020: One of the many shale ash hills that dot the landscape in northeastern Estonia. These artificial hills are made from the waste ash produced when oil shale, a sedimentary rock that is abundant in the region, is processed into power or oil.
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JOEL CARILLET
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Estonia
Kiviõli, Estonia - February 22, 2020: One of the many shale ash hills that dot the landscape in northeastern Estonia. These artificial hills are made from the waste ash produced when oil shale, a sedimentary rock that is abundant in the region, is processed into power or oil.