Final answer:
Iceland is the island located above the North American, Eurasian, and African Plates on the Mid-Atlantic Ridge, allowing for unique geological observations such as the visible rift at the Þingvellir National Park.
Step-by-step explanation:
The island that sits above the North American, Eurasian, and African Plates on the Mid-Atlantic Ridge is Iceland. This unique location makes Iceland one of the only places in the world where the Mid-Atlantic Ridge is visible above sea level.
The formation of Iceland is directly tied to the activity along the ridge, where rift zones and volcanic activity lead to the creation of new basaltic crust as a result of tectonic plates pulling apart.
What's more fascinating is that in places like the Þingvellir National Park, one can observe the rift and even snorkel between the North American and Eurasian Plates, truly experiencing the dynamic forces that shape our planet.