Here's why:

* Divergent Plate Boundaries: These occur where tectonic plates move apart. This creates space for magma to rise from the Earth's mantle, forming new crust and volcanic activity.

* Mid-Atlantic Ridge: This is a major underwater mountain range where the North American and Eurasian tectonic plates are pulling apart. Iceland is situated on this ridge, making it a hot spot for volcanic activity.

Therefore, the plate boundary near Laki volcano is a divergent plate boundary.