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

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asked Aug 6, 2018 7.3k views

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Iryna Batvina · Answer 1 · 2018-08-12T09:24:25+0000

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.

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

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