Can anyone help me plz? Due tm

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.

The nations of indochina a. share a common langauge b. share a common history c. share a common religion d. none of the above

What is the largest river in the united states?