what kind of plate boundary runs across iceland?

The kind of plate boundary that runs across Iceland is a divergent plate boundary. Specifically, Iceland sits on the Mid-Atlantic Ridge, where the North American and Eurasian tectonic plates are pulling apart from each other. This divergent boundary causes magma to rise up from below the Earth's surface, creating new crust, which leads to significant volcanic activity and the formation of rift valleys, such as the one visible at Thingvellir National Park. Iceland is unique because the Mid-Atlantic Ridge here rises above sea level, allowing the plate boundary to be observed directly on land.