地球的结构有点像鸡蛋,地壳好像薄薄的蛋壳,地幔好比蛋白,地核好比蛋黄。地球刚开始形成的时候,并没有这样的分层结构。那么,地球的地核与地幔、地壳是什么时候形成的呢?要了解远古时代所发生事件的准确时间,目前往往利用放射性元素的衰变性质来确定,这种测年方法也叫做放射时 Earth’s structure a bit like an egg, the crust like a thin shell, the mantle is better than the protein, the nucleus is better than the egg yolk. When the earth first came into being, there was no such hierarchical structure. So, when the Earth’s earth and mantle, crust is formed? To understand the exact time of events in ancient times, the decay properties of radioactive elements are often used to determine, this dating method is also called radiation