40.4 MB (4.4 MB compressed)
5334 x 2650 pixels
45.2 x 22.4 cm ⏐ 17.8 x 8.8 in (300dpi)
ALEX BARTEL / SCIENCE PHOTO LIBRARY ALEX BARTEL / SCIENCE PHOTO LIBRARY
Cement works beside a railway and road in the American Midwest. The cement hardens when water is added to it, binding aggregates such as sand and gravel together to form concrete.
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