Question

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.

Answer 1

When the gulf stream reaches as far north as it can go, it will cool. Then is begins flowing away from the pole. This will cause cooler climates the farther south it goes until the water in the stream warms up again. 

Answer 2

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.