coal

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Pollution from coal power plant Royalty Free Stock Photo

Ancient coal mine Royalty Free Stock Photo

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Opencast coal mine Royalty Free Stock Photo

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Coal. Geological collection in Colombia for geologists. Study of soils, minerals and rocks. Identification of rocks and minerals. Professional career in geology. Textures and backgrounds, rocky effects. Background with rock texture, rough. Geologists and soil scientists. Sample obteined in Oberhausen Ruh, Alemania. Geology.