I believe one of them is Indonesia?
Some mountains are volcanoes, and some volcanoes are mountains, but not all mountains are volcanoes, and not all volcanoes are mountains. For a mountain to be a volcano and a volcano to be a mountain, it must be formed from magma and volcanic materials from below the Earth's surface.
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you should put this question under math so people who know math can answer it. This is geography not geometry
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