照片里被时间凝固下来的黑黑的面孔盯着他们。
在过去，当岩浆流冷却凝固下来时，水被困住了，因此那里包含了蓄水层。
In the past, water has become trapped also, when lava flows hardened, and thus there are aquifers involved.
岩浆冷却并凝固下来后，地磁场的方向和磁极被保留在磁化了的火山岩中。
When the magma cools and solidifies, the direction and the polarity of the field are preserved in the magnetized volcanic rock.
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