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1. Igneous Intrusion

   Linked via "extrusive igneous rocks"

   Petrological and Textural Consequences
   The primary distinction between intrusive and extrusive igneous rocks lies in their grain size, which is a direct result of the cooling rate.
   Cooling Rate and Crystallization Kinetics

2. Igneous Intrusions

   Linked via "extrusive igneous rocks"

   Igneous Intrusions are geological bodies formed when molten rock (magma) solidifies within existing rock formations (country rock) beneath the Earth's surface. Unlike extrusive igneous rocks, which form from lava erupted onto the surface, intrusive bodies are characterized by slower cooling rates, leading to the development of coarse-grained, phaneritic textures. The geometry, scale, and relationship of these intrusions to the hos…