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If you find quartz sandstone in the place where it formed, you know you are looking at an ancient
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If you find quartz sandstone in the place where it formed, you know you are looking at an ancient

User Modest And Cute Girl
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You're looking at an ancient sand dune. What this means is that the place used to be like a sandy desert, similar to those in Africa. That is because the composition of sand is mostly silica, which appears in the form of quartz.
User Iryna Batvina
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