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Create 3 equivalent fractions using the area model for 2/5create equivalent fractions using number lines for 1/2create equivalent fractions using multiplying for .3/4brainliest

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.

All of the following occurred due to the invention of the railroad except