Please these points are for my two friends please don't answer am helping them out they need the points

after am done giving away points to you guys

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 of the following is not a reason why shenzhen, china, is considered an emerging global city

This desert is found in the northern part of africa and covers 3.5 million square miles.