what type of structure extrusive rocks have
Answers
Answer:
Dome shaped
Explanation:
Domes typically solidify to form the rich in silica extrusive rock obsidian and sometimes dacite domes form the extrusive rock dacite, like in the case of Mount St.
Answer:
The texture of extrusive rocks is characterized by fine-grained crystals indistinguishable to the human eye, described as aphantic. Crystals in aphantic rocks are small in size due to their rapid formation during eruption.[3] Any larger crystals visible to the human eye, called phenocrysts, form earlier while slowly cooling in the magma reservoir.[4] When igneous rocks contain two distinct grain sizes, the texture is porphyritic, and the finer crystals are called the groundmass.[3] The extrusive rocks scoria and pumice have a vesicular, bubble-like, texture due to the presence of vapor bubbles trapped in the magma
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