Rock A formed from lava with lower viscosity. Which rock is associated with lower viscosity?

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Multiple Choice

Rock A formed from lava with lower viscosity. Which rock is associated with lower viscosity?

Explanation:
Lower viscosity lava flows easily and tends to produce rocks with mafic composition that crystallize into fine-grained or glassy textures, like basalt. Since Rock A formed from lava with lower viscosity, it is the rock associated with low-viscosity magma. Rock B would be tied to higher-viscosity magma, not the low-viscosity case. So Rock A is the rock associated with lower viscosity.

Lower viscosity lava flows easily and tends to produce rocks with mafic composition that crystallize into fine-grained or glassy textures, like basalt. Since Rock A formed from lava with lower viscosity, it is the rock associated with low-viscosity magma. Rock B would be tied to higher-viscosity magma, not the low-viscosity case. So Rock A is the rock associated with lower viscosity.

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