Why does the velocity of P-waves decrease at the mantle-outer Core boundary? a. The outer core solid iron
b. The outer core is liquid
c. The outer core is more dense
d. The outer core is a gas

How have ethnic groups shaped the population in central america and the caribbean? how has migration shaped the population in central america and the caribbean? how has small land areas shaped population in central america and the caribbean? how has a rapid population growth shaped the population in central america and the caribbean?