GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY GIPHOTOSTOCK / SCIENCE PHOTO LIBRARY
Chalk in water, 2 of 3. When chalk (calcium carbonate, CaCO3) is added to water (Photo JG3501) and stirred, it does not dissolve but forms a suspension (Photo JG3502). After some time (a couple of days here) chalk settles at the bottom of a container (Photo JG3503).
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