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Diamonds come in a variety of colors like green, yellow, blue, grey, and more. Those colors are called 'fancies'. The rarest one is red. 1).
Rocks can be divided into three categories depending on where they were created: sedimentary, igneous, and metamorphic. Sedimentary include e.g lime, while igneous include granite, and metamorphic: marble. 2).
Sometimes bolts of lightning can strike the beach. If it is a sandy beach, the heat of the lightning can melt the sand and create fulgurite, a glassy rock. 3).