Great for elementary and middle school as an intro to new material. This article tells the story of once upon a time, an entire cargo boatload of rubber duckies dumped into the middle of the Pacific Ocean. Over time, the duckies appeared on shores all across the world, and this gave scientists an idea of how the ocean currents flow all across the world!
Vocab words: surface ocean current, deep ocean current, global conveyer belt, gyres
Check out 300+ articles just like this, written at 7 reading levels here