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Making the world better, one answer at a time. Iceland is continually growing because of volcanic activity. As the lava erupts and runs into the sea, it cools and becomes solid land.
Iceland is the largest island on the ridge because of the additional volcanism caused by the hot spot beneath the country, which moves slowly towards the northwest. The tectonic plates move towards east and west, and both the North American and Eurasian systems move to the northwest across the hot spot.