Testing soil samples. Scientist using a soils sample grader (upper left) in a laboratory at a quarry. The quarry produces Fuller's earth,a highly absorbent clay. The sample grader consists of a tower of sieves that get gradually finer from top to bottom. Photographed in Oxfordshire,UK | |
Lizenzart: | Lizenzpflichtig |
Credit: | Science Photo Library / Allen, Steve |
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