Salt: The Rock That Flows
Frontiers for Young Minds(2023)
Abstract
Salt is a substance with many uses, including as a condiment for our food. Salt is also a rock, and it can be found underground in many places around the world. What makes rock salt fascinating is that, over hundreds to millions of years, it is a rock that flows! Over long periods of time, salt behaves a bit like honey—like a thick, viscous liquid. This means it can change shape faster than other rocks and it can be squeezed to the surface like toothpaste out of a tube. Salt can also flow like ice does in glaciers. Understanding how salt changes shape is important because underground salt is often used to store useful or dangerous substances, such as petroleum or nuclear waste.
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