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Only one president, <u><em>Woodrow Wilson</em></u>, had a doctorate, and was president of Princeton University before becoming the U.S. President.
A ) the creation of the north American free trade agreement in 1994.
Answer:
In geology, the term sial refers to the composition of the upper layer of Earth's crust, namely rocks rich in aluminium silicate minerals. It is sometimes equated with the continental crust because it is absent in the wide oceanic basins, but 'sial' is a geochemical term rather than a plate tectonic term.
Explanation:
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