Someone who heads a farming company is best described as a/an

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.

Fill in the combination notes for the main idea shown

An igneous rock that contains mostly pyroxene and olivine has what type of composistion