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Most lava stone is colored in shades of grey and black, but basaltic cinders are sometimes red, taking their hue from oxidized iron minerals present in the lava flow. Although all lava rock is ancient in its origins, having formed in the earth's core over millions of years, not all deposits on the surface are necessarily old. Volcanic activity is ongoing, and eruptions frequently happen. On average, it's estimated that around 50 to 70 volcanoes erupt annually, with some individually erupting between 60 to 80 times each year.