Once the gulf stream reaches the far north, what happens next?
it cools and flows away from the pole, causing cooler climates farther south.
it circles the poles, becoming ice.
it crashes with incoming warm water.
it flows away from the pole, causing warmer climates farther south.

Once the Gulf Stream reaches the far north, it cools and flows away from the pole, causing cooler climates farther south. (First option provided).

The Gulf Strean is a warm and swift Atlantic Ocean current along with its northern extension the North Atlantic Drift. The Gulf Stream originates in the Gulf of Mexico and extends to the tip of Florida following the eastern coastlines of the United States and Newfoundland before spanning the Atlantic Ocean.

the mongolian invasion of china and central asia resulted in a disruption of the silk road as the chinese garrisons lost support from the chinese kingdoms which fell under the mongols. however, as the mongols established a formal dynasty in china, the successors of genghis khan restored the garrisons along the silk road allowing the safe travel caravans again.