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Pumice is an igneous rock that has a sponge-like appearance due to its high porosity and the presence of numerous gas bubbles trapped within its structure.
No, orbicular rhyolite is not a metamorphic rock. It is a type of igneous rock that forms from the cooling of silica-rich magma. Orbicular rhyolite is characterized by its spherical clumps of minerals, giving it a distinctive appearance.
Igneous rock is formed when magma cools and becomes solid.
Because that is the very definition of igneous rock.
Cooling and solidifying magma turns into igneous rock.
Extrusive igneous rock such as basalt, rhyolite, pumice, and obsidian.