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50.3 MB (50.0 MB compressed)
5138 x 3425 pixels
43.4 x 29.0 cm ⏐ 17.1 x 11.4 in (300dpi)
DIRK WIERSMA / SCIENCE PHOTO LIBRARY DIRK WIERSMA / SCIENCE PHOTO LIBRARY
Brown coal (lignite). This form of coal has a high moisture and ash content, and is a more polluting form of coal than the higher (black) grades of coal. It is a sedimentary form of carbon, and the layers of compressed organic matter can be seen in this sample.
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