The group that later took control of the Holy Land, attacked pilgrims, and led Pope urban to call for the crusades was the Seljuk Turks. The correct answer is C.
The answer is all of the above.
A gravel covered plain is called a Reg. A reg is a desert basin where the sand has been blown away leaving a gravel covered plain.
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The first natives came from Asia the part that is now known as Siberia Russia
So your answer is (A) Asia