本文介绍了地球内部的主要层次结构，包括地核（分为内核和外核）、地幔和地壳，并解释了莫霍洛维奇不连续面的概念。内核为固态，主要由铁构成；外核呈液态，同样富含铁；地幔位于地壳和地核之间，随着深度增加，压力和温度也随之增大；地壳是地球最外层的固体部分。
Internal Layers ：inner core，outer core，mantle，crust。
inner core : the innermost region of the earth. It is solid and consists primarily of iron with minor amounts of light elements that likely include nickel, sulfur, oxygen.
outer core : a region surrounding the inner core. It is liquid and consists primarily of iron with minor amounts of lighter elements that likely include nickel, sulfur, oxygen.
mantle : main bulk of Earth between the crust and the core; increasing pressure and temperature with depth divide the mantle into concentric layers.
crust : outer shell of the solid Earth; the lower limit is usually considered to be the Mohorovicic discontinuity.
Mohorovicic discontinuity : boudary between crust and mantle, marked by a rapid increase in seismic wave speed.
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