At the beach. Its not desert like and its the only logical explaination I can logically come up with.
The main mechanism through which the layering happened is gravity: it pulled the heavier, denser material to the center, leaving the less dense material on the surface.
The material that was on the outside cooled quicker, but this was the result, not the cause.
The answer is
<span>2) Gravity caused more-dense material to move toward the center of each planet.</span>
They ensure continued for production
Europe by the influence of migration and the distinct ethnic groups of each country. ... World War II shaped the population patterns of Western Europe by its history, ... and ancient history that have shaped the sub-region's population patterns. ... The culture of ancient Rome still influences southern Europe.<span />
