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The primary agent of contact metamorphism is

About 140,000 japanese died in this japanese city when americans dropped an atomic bob at the end of world war ii

You have been tasked with sorting the rock samples shown into three categories, with two rocks in each category. what attribute would you use to sort these rocks? which rocks would be in each category? rocks: obsidian, coquina limestone, granite, soapstone,pumice, and gneiss.