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As the two tectonic plates shift, fissures periodically form in the crust that allow molten rock from underground to surface as lava, creating Iceland's many volcanoes.

Answer:

The Mid-Atlantic Ridge is on a divergent boundary where there is a lot of volcanic activity. An island formed from these volcanic eruptions. The hot magma reached the surface, cooled, and eventually formed the land we now know as Iceland.

Explanation:

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