The explanation may be in Earth's mantle, the layer of rock underlying the tectonic plates and extending down over 1,800 miles to the outer edge of Earth's iron core.

解释可能是在地球的地幔中，这是在构造板块下面的岩石层，向下延伸超过1800英里到地球铁芯的外边缘。

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Scientists are studying past changes in sea level in order to make accurate future predictions of the consequence of climate change, and they are looking down to Earth's core to do so.

为了准确预测未来气候变化的结果，科学家正在研究过去海平面的变化，他们准备通过观察地核来进行这项研究。

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So clear are the steaming pools that to stare down into them is like staring down into a cave that leads to the earth's core.

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