All igneous rocks exhibit identical grain size.

Name: All igneous rocks exhibit identical grain size.
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Igneous rocks can have varying grain sizes depending on a number of factors such as cooling rate, composition, and location of formation. For example, volcanic rocks tend to have fine-grained texture due to rapid cooling, while intrusive rocks can have coarser grains due to slow cooling in the Earth's crust.

All Igneous Rocks Exhibit Identical Grain Size