Is there any multiple choice answers
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The Mongols spread the use of gunpowder.The Mongols controlled both China and Russia.<span>Pax Mongolica encouraged trade along the Silk Road. I would say these are the main effects of the Mongol incursion into Europe and Asia plus the inadvertent introduction of the bubonic plague of infected rats from Asia to Europe.</span>
It is part of human nature. The drive to become rich, and to take the gold, is the whole reason that the dwarves started off in the first place. They were greedy for the wealth. They were blinded to the position that they were in. Even when Bilbo took the Arkenstone Thorin didn't pay attention, and turned his back on him.