A geologist is comparing the properties of different minerals. He rubs each one on a piece of white tile and observes the color of the powder that is left behind. What type of test did he perform?
A. color
B. hardness
C. luster
D. streak

What is the difference between the cultures of central asia and the caucasus region? the majority of people in central asia are muslim; the majority in the caucasus region are christian. the primary language in central asia is armenian; the primary language in the caucasus region is russian. central asia has been plagued by ethnic unrest; the caucasus region has had little ethnic conflict. the effects of soviet rule can still be seen in central asia; the caucasus region has developed its own identity since the fall of the ussr.