| 1. | Basalt is the commonest volcanic rock .
玄武岩是最普通的火山岩。
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| 2. | This is unlike volcanic activity above the sea .
这同高出洋面的火山活动是不同的。
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| 3. | For millions of years, the area was highly volcanic .
这个地区几百万年来火山活动强烈。
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| 4. | The most impressive volcanic phenomena are explosive eruptions .
最令人难忘的火山现象是爆炸喷发。
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| 5. | Volcanic rocks have high susceptibilities under normal conditions .
火山岩在正常情况下有强的磁化率。
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| 6. | Most volcanic eruptions in recorded history have blown skyward .
历史上有记载的大多数火山喷发是向天空喷发的。
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| 7. | A group of volcanic vents will produce a lava of the same mineral composition .
一群火山口将产生相同矿物成份的熔岩。
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| 8. | The islands being wholly of volcanic origin, the soil is necessarily very rich .
岛上全是火山地带，土质自然非常肥沃。
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| 9. | Active faults and lineaments, and recent volcanic activity were re-examined .
对活断层，线状区和近代火山活动都重新作了研究。
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| 10. | Earthquakes commonly accompany volcanic activity on movement of magma deep in the earth .
地震通常都伴随着火山活动或地球深处的岩浆运动。
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