Answer:
As the slab gets to a certain depth, it gets hot enough that it start to melt again. As it melts, it undergoes differentiation and also gets less dense. Low density means that it will start to rise back up again, usually, as granitic magma.
Explanation:
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They believe that governments should meddle into things like economy to improve the lifestyle of others. Socialists usually claim that it is necessary for a government to intervene and deal with businesses and the economy because that ensures that there's equal rights for all people and people are protected from exploitation and monopolies and similar things.
In Western Europe, the war was largely a stalemate as a result of extensive trench warfare that gave the defenders a massive advantage during battles. In Russia, however, the monarchy was overthrown by rebels, who then negotiated peace and surrendered large chunks of land to the Germans, allowing them to concentrate all their troops and resources to the Western Front.
Marius's election as a consul made the most sweeping changes to the Roman army. They were known as the Marian Reforms. Shortly after his election, he increased the numbers of the active army as he was concerned about a Barbarian invasion. Marius relaxed the strict recruitment policies. Until then, a Roman soldier had to provide his own uniform and weapons, own land and be of a certain social class and a Roman citizen. Marius allowed all Roman citizens to join the army irrespective of what social class they were. They also did not have to own land.
