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1.地球与其他类地行星的不同之点在于,前者经历了极为复杂而多样的地质发展史,造成了地球外部圈层的极不均一的构造。地球的第一发展阶段——<前地质时期>,它可与月球相类比,在月球上发现有年龄大于42亿年的月海玄武岩,而地球上的则很可能是大型冲击坑构造中的原始硅镁质壳层,但其保存下来的遗迹已被极度改造过了。与这一阶段相反,第二阶段为远太古宙(42—35亿年),由“灰色片麻岩”构成的岩群在各大陆区内都有出露,它们有深成的,也有表壳成因的,因而证明了它们所造成的作用的多样性。至太古宙初,在相
1. The difference between the earth and other terrestrial planets lies in the fact that the former has undergone a very complicated and diverse geological history and has created a very inhomogeneous structure of the Earth’s outer circle. The first stage of the Earth’s development, the “pre-geological period,” is analogous to that of the Moon. The Moon Sea basalts more than 4.2 billion years old are found on the moon, The original magnesian shell, but the remains of its preserved has been extremely modified over. Contrary to this stage, the second stage is the Far Archean (4.2-35 billion years), and the group of “gneiss” gray rocks are exposed in all continents. They are deep and have The genesis of the shells justifies the multiplicity of their effects. To the beginning of the ancient universe, in phase