Basaltic magma has the lowest viscosity,so more of it reaches the surface;the more viscous rhyolitic magmas are so sluggish that they tend to be trapped deep below the surface where they cool,solidify,and grow into the larger mineral crystals of plutonic rocks.

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Basaltic magma has a lower viscosity than rhyolitic magma, and as a result, it can reach the surface more easily. Rhyolitic magma is more viscous and can become trapped deep beneath the surface, where it solidifies into plutonic rocks with larger mineral crystals.

Basaltic Magma Has the Lowest Viscosity,so More of It Reaches