Why do rivers usually have some water in them, even during a drought? a. there is always some runoff. b. rivers cut into saturated ground. c. rivers cut into unsaturated ground. d. there is always some water above the water table.

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.