Explain how climate variations can induce changes in the global ocean circulation

Ocean currents have a profound influence on climate

Further Explanation:

Ocean currents move lots of heat across the planet - roughly the same amount as the atmosphere does. The oceans are confined by land masses, so that their heat movement is more localized and channeled into specific regions.

doctrine that the us had the right to expand throughout north america.

i think it's severe storms but i might be wrong