National Security - Physical Ocean

which current brings cold, nutrient-rich water from the Southern Ocean up the west coast of South America?

what % of the world’s fish catch comes from the Humboldt Current’s large marine ecosystem?

which current supplies relatively warm water to the coast of Alaska and western Canada?

which current carries this surface water relatively rapidly toward the poles?

what % of the international trade moves into and out of the United States by ship?

what % of the world's trade is carried on the ocean?

why is unrestricted and efficient ocean-based trade is vitally important to the global economy?

what causes tsunamis?

what is the effect that causes cyclones to spin counter-clockwise in the northern hemisphere, and clockwise in the southern hemisphere, the same direction that water flows down a drain?