In several places in the Japanese archipelago, volcanoes are still active. Volcanoes do not form all archipelagoes. Many archipelagoes are continental islands formed only after the last ice age. As glaciers retreated, sea levels rose and low-lying valleys were flooded. read more
AN ARCHIPELAGO LOOKS LIKE BUNDLES OF COUNTRIES STUCK TOGETHER i think a archipelago is around a volcano and there is supposed to be a hot spot i know this did not help much but that's my way of thinking it From different user. read more