Someone know the answer?

Macbeth and lady macbeth are partners in the nurder of duncan and both become

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.

Irelanda. populationb. square mileagec. average population density per square mile