Iceland owes its existence to the divergent boundary of the North American and Eurasian tectonic plates along the Mid-Atlantic Ridge. As these plates pull apart, magma rises, erupts, and solidifies, continuously creating new land. This plate-tectonic process has built an island with dramatic volcanoes, lava fields, glaciers, and geothermal areas over millions of years. Iceland is essentially the exposed crest of the Mid-Atlantic Ridge, making it a unique subaerial expression of seafloor spreading.