A review of igneous rock identification as presented for an introductory level physical geology class to access versions with cc embedded quizzes and s. What are igneous rocks igneous rocks form from the cooling of magma molten materials in the earths crust the terminology igneous means fire or heat. Igneous rocks are classified on their composition and grain size which indicates whether they are intrusive or extrusive review questions what is the visible difference between an intrusive and an extrusive igneous rock. The intrusive rocks solidify slowly inside the crust so they have coarse grained texture while the fine grained effusive rocks solidify rapidly at the earths surface for example basalt is an effusive analogue of gabbro the rocks which are mentioned above have almost the same composition but gabbro is formed under the surface inside the . Characteristics of igneous rocks magma is molten rock inside the earth it is the source of all igneous rock because the earth was largely molten at its origin magma may be considered the beginning of the rock cycle
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