Continued bombardments and internal pressures made the growing Earth hotter, causing its interior to melt and the heavier elements to sink and form Earth's core.

持续的轰击和内部压力使成长中的地球越来越热，导致其内部融化，较重的元素下沉形成地核。

They were likely hired by one of the city's elite, perhaps a Roman official wanted Pompeii-like interior to remind him of home.

他们很可能是被这个城市的其中一个精英雇佣的，也许是一位罗马官员想要庞培式的内部装饰，好让他怀念家乡。

GEOTHERMAL heating-using the warmth of the Earth's interior to heat water-is an old idea.

利用地球内部的热量加热冷水被称为地热加热，这不算什么新思想。