CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY CORDELIA MOLLOY / SCIENCE PHOTO LIBRARY
Peat bog. Peat layer under heather, grass and moss on upland bog in Snowdonia, Wales. Peat is of organic origin, comprising plant debris that decomposed in anaerobic (airless) conditions, such as in a waterlogged area. Peat can be used as a fuel and as a fertiliser.
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