geological section soil layers coal and rock overburden open mine anthracite dark texture black color |
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| navigate by keyword : anthracite background bitumen black brown clay cliff coal crust cut dirt dry earth environment geology granite graphite ground land layers light matte mine miner mud natural nature oil open outdoor overburden panorama petrified plant point rock rough sand section shiny slate slit soil stone stripping structure texture underground vein view |
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| Geological section of soil, layers of coal and rock. Overburden open mine anthracite. Dark texture black color. |
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