Armenians (they are in the Caucasus region, not Central Asia) differ from the people in Central Asia by origin, culture, folklore, language, alphabet, religion.
Armenians (94%) are Christians, followers of their own authentic Armenian Apostolic Church, while most of the Central Asians are Sunni Muslims, practice shamanism, and Buddhism (in Mongolia).
Armenians are an ethnicity native to the Caucasus region, closely related to Georgians, while most of the Central Asians have Turkic, Mongol and North Iranian ethnic background, the same also goes for he language, culture and folklore.
Armenians have unique alphabet used only by them, while the Central Asians use Latin and Cyrillic alphabets.
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Let's see where the word tumultuous is used here:
Magellan named the ocean Pacifico (Pacific) which means peaceful because, compared to the tumultuous strait they had just been through, the ocean was amazingly calm.
We see that they named the ocean the Pacific Ocean because it was very peaceful and calm compared to a tumultuous strait. This shows us that tumultuous is probably the opposite of peaceful. It probably means crazy, hectic, rough, harsh, etc. After going through a crazy thunderstorm, a light sprinkle would seem very peaceful, which is similar to how Magellan probably feels here.
This definition matches best with answer A. rough and uncertain.
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Because the more people that move out the more people will move in and vice versa.

The Correct choice is C
<u>Demography</u> is the study of human populations and how they grow or decline.