The Dead Sea is a giant, super-saline lake at the lowest spot on Earth. And its beaches appear to be pebbled with perfect little cubes of salt. Crystal solids with flat sides like salt are symmetrical in shape because their molecules are arranged in a repeating pattern of positive and negative ions; the bonds between these electrons and protons are formed from electrostatic forces. Salt crystals are always cube-shaped, though impurities can cause crystals to grow into jagged chunks. Read more.
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