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Most volcanic rocks are porous due to:
Single Choice
Most volcanic rocks are porous due to:
A.
Erosion
B.
Marine organisms
C.
Rapid cooling
D.
Gases trapped inside lava
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[单选题] What impurity found in coal contributes most significantly to acid rain?
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[问答题] Flowering plants are grouped into what 2 classes named after their number of seed leaves?
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