13. Sample M4 is called: a. marble
b. quartzite
c. schist
d. gneiss
e. slate
f. anthracite
g. amphibolite

Which are evidence of the seafloor spreading? a. molten material b. magnetic stripes c. continental material d. drilled core samples e. ocean water samples

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.

Match the region in column 1 to the river in column 2