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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).
1 Rocks formed from the direct cooling of a lava flows. 2  These are the volcanic igneous rocks such as basalt, andesite and rhyolite. 3  Rocks formed from solid fragmental volcanic materials.4  These are called pyroclastic materials and rocks. 5  Pyroclastic means fiery fragments.here are two major forms of volcanic rocks. 1  Rocks formed from the direct cooling of a lava flows. 2  These are the volcanic igneous rocks such as basalt, andesite and rhyolite. 3  Rocks formed from solid fragmental volcanic materials.