The atmosphere and Earth's interior are layered by density. Gravity pulls more strongly on denser materials so denser materials are at the center of things. Earth's core, at its center, is denser than its crust.
They are all top producers of diamonds
The answer is C. Hope i could help
Aegean Sea, the Black Sea, the Caspian Sea and the Ural River
All water boundaries
My geography teacher was telling us as well it is known as the Eurasian boundary as well