Distinguish between volcanic and pultonic igneous rock
Geology
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Volcanic and plutonic igneous rocks are distinguished primarily by their place of formation and subsequent cooling rate, which dictates their crystal size.
- Volcanic (Extrusive) Igneous Rocks: Form when magma erupts onto the Earth's surface (as lava) or explodes into the atmosphere (as ash). They cool rapidly due to exposure to air or water, resulting in very fine-grained (aphanitic) crystals, or even a glassy texture if cooling is extremely fast. Examples include basalt, rhyolite, and obsidian.
- Plutonic (Intrusive) Igneous Rocks: Form when magma cools and solidifies beneath the Earth's surface. They cool slowly because they are insulated by surrounding rock, allowing ample time for large, coarse-grained (phaneritic) crystals to grow. Examples include granite, gabbro, and diorite.undefined
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