Which of the following causes the different densities of oceanic crust and continental crust?
a. ocean depth
b. types of rock
c. age of the rock
d. temperature of the rock

At a continent-continent convergence,

Why have the countries of the region had difficulty establishing democratic governments in recent years? choose all answers that are correct b is also correct i need to know if theres any morecommunists have overtaken the countries of the caucasus region. the soviets established national borders in the region without considering the location of ethnic groups. fighting continues between armenia and azerbaijan over the nagorno-karabakh region. civil war between communists and islamic groups in tajikistan resulted in thousands of deaths and refugees are forced to flee. in a test!

What are the answers for the following questions?