地核
地核（Core）係位於地球嘅最內部。半徑大約有 3470 km，平均密度每立方厘米重 12 克。温度大約有 4000 - 6000 ℃。
地核可以再細分為內核同外核。內核半徑大約有 1220 km，一般相信係內核由鐵同鎳組成，有人認為內核由一種鐵晶體組成。由地震波嘅傳送得知，外核係鎔嘅，地球磁場嘅自激發電機理論，亦需要一個液態金屬外核嘅存在先至可以成立。
睇埋
註
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