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← GeographyWhich outcome follows when cooled lava contracts in the Earth's crust?
A)Columnar jointing occurs in basalt✓
B)New andesite forms faster underwater
C)Surface pressure increases in magma
D)Silicate lava cools into obsidian
💡 Explanation
As basalt lava cools, volume decreases, causing tensile stress until fracture via thermal contraction; therefore, columnar joints appear throughout the rock, rather than new rock forming, or pressure greatly increasing, because of shallow depth.
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