3. the amazon river is deep and wide enough to be but it’s seldom used by large commercial ships because it flows through few cities. a. impassable b. navigable c. charted d. developed

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.