Regions of the ancient lava field, which flowed from volcanoes 201.4m years ago, are preserved in sediments in Newark and Hartford, in the north-eastern US.
这些201.4万年前从火山口流下的古老熔岩被保存在美国东北部纽瓦克和哈特福德的沉积物中。
This lava field just north of the Mýrdalsjökull ice cap serves as one of many monitoring sites to track ground deformation that could serve as a signal of an impending eruption of Katla.
这片位于米达尔斯冰盖北部的熔岩原是用来追踪地面形变的监测点之一，这里地面的形变可以被视为卡特拉火山喷发的前兆。
As the rocks cool from lava, for instance at the deep mid-ocean ridges where the earth's surface plates are formed, crystals line up with the direction of the magnetic field.
举例来说由熔岩冷却的而来的岩石，位于深深的海中央山脊的地方就形成了地球表面的板块，水晶晶体排列方向与磁场方向一致。
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