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Rhyolite caldera complexes are the most explosive of Earth's volcanoes but often don't even look like volcanoes. They are usually so explosive when they erupt that they end up collapsing in on themselves rather than building any tall structure (George Walker has termed such structures inverse volcanoes).
3 Granophyre Granophyre is an intrusive igneous rock similar to granite. It is sometimes associated with an area of the Earth affected by a bolide impact! 4 Porphyritic Andesite Andesite is the second most common volcanic rock on Earth. It has intermediate composition (between basic Basalt and acid Rhyolite). Granophyre Granophyre is an intrusive igneous rock similar to granite. It is sometimes associated with an area of the Earth affected by a bolide impact! 4 Porphyritic Andesite Andesite is the second most common volcanic rock on Earth. It has intermediate composition (between basic Basalt and acid Rhyolite).