Geologists observe two rocks that were originally formed from lava. Rock A is dark-colored and Rock B is light-colored. Which rock formed from lava with the higher viscosity?

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Multiple Choice

Geologists observe two rocks that were originally formed from lava. Rock A is dark-colored and Rock B is light-colored. Which rock formed from lava with the higher viscosity?

Explanation:
Rock B is the higher-viscosity lava origin. Lava viscosity tracks silica content and temperature: felsic, light-colored magma has more silica and is more viscous, while mafic, dark-colored magma has less silica and flows more easily. Since Rock B is light-colored, it reflects a felsic composition and higher viscosity, whereas Rock A is dark-colored and corresponds to a lower-viscosity, mafic magma.

Rock B is the higher-viscosity lava origin. Lava viscosity tracks silica content and temperature: felsic, light-colored magma has more silica and is more viscous, while mafic, dark-colored magma has less silica and flows more easily. Since Rock B is light-colored, it reflects a felsic composition and higher viscosity, whereas Rock A is dark-colored and corresponds to a lower-viscosity, mafic magma.

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