Which best explains why online retailers keep data about their customers? to ensure customers leave good reviews to prevent customers from shopping elsewhere to sell customer information to others to maintain records of customers’ buying habits

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.