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QuizMultiple Choice

Igneous Rock — Quiz

Question 1 • Earth and Space Science

Which explanation best accounts for the mineral and structural features observed in this sample?

Answer
A
The crystal structure suggests growth under stable pressure conditions that disrupted the alignment of mineral grains.
B
The uneven crystal distribution indicates rapid magma ascent, where heat loss prevented uniform crystallization across the rock.
C
The rock likely formed at the surface during explosive lava cooling, producing vesicles and trapping volcanic gases.
D
The rock likely formed in a deep setting, where unusual chemical conditions enabled selective crystal growth within a finer matrix.
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