Rivers in the Sea: How Ocean Currents Shape Our World

In 1992 a cargo ship crossing the Pacific Ocean lost a container overboard in a storm. Inside were 28,000 plastic bath toys — rubber ducks, frogs, and turtles. Over the next 15 years those toys washed up on beaches in Alaska, Scotland, Iceland, and even Australia. Nobody steered them. So what invisible force carried them across entire oceans and delivered them to coastlines thousands of kilometres apart? That invisible force is an ocean current — and by the end of this lesson you will be able to explain exactly how it works.