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Rocks

Andesite

Article by: Hobart M. King, Ph.D., RPG Andesite: The specimen shown is about two inches (five centimeters) across and has a porphyritic texture. Igneous rock composition chart: This chart shows that andesite is typically composed of plagioclase, amphiboles, and micas; sometimes with minor amounts of pyroxenes, quartz, or orthoclase.
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Sql Query in Postgresql

I am trying to execute a query but I am stuck. I have two tables A and B. The a table has columns gid, geometry(line-string) and value which cells is empty , the B table has got 3 columns gid, geom…
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