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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.

The creation of the trans-siberian railway allowed people to travel across russia. how could this railway impact russian culture?

The process by which liquid water changes into water vapour is called what ?