In recent years, candidates' campaigns have shown increasing sophistication in creating newsworthy events for journalists and tv camera crews to cover. this effort is commonly referred to as

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.