Which is capable of housing astronauts while they conduct research? A. A rover
B. A satellite
C. A space station
D. A space observatory

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.