What is the common gcf of 54 and 27

Evaporite rocks te more permeable than reef rocks true false

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.

Which event had the greatest impact on culture of south america