It can be most reasonably inferred that which of the following accounts for the lack of a geological record concerning答案解析-雷哥GRE

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I submit that impact of solid bodies is the most fundamental of all interstellar processes that have taken place on the terrestrial planets: without impact, Earth, Mars, Venus, and Mercury would not exist.

Simply put, the collision of smaller objects is the process by which the terrestrial planets were born. On the surface, that the geological record of the earliest history of impacts on the terrestrial planets has been lost, is troubling. As the process is self-erasing, to a certain extent, the earliest record would have been lost even if processes of melting and internal evolution of the planets had not occurred. But much of the record of the last stages of accretion of the planets is preserved, especially on the moon, Mercury, and Mars. In fact, the last stage of accretion is still going on, albeit at a very slow rate. This is fortunate, because we can study many aspects of the processes of planetary birth by investigation of the nature of small bodies that still exist, the dynamics of their orbital evolution, and the effects that they produce when they ultimately collide with a planet. If impact and accretion were not still occurring, it would be hard to come to grips with a number of difficult problems of planetary origin and early evolution.

It can be most reasonably inferred that which of the following accounts for the lack of a geological record concerning the history of impacts on the planets?

the violence of the initial impact an outcome that is not self-erasing a process of change in planets themselves the absence of proof relating to a hypothetical collision the ongoing process of accretion

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679698ozmh

文中说就算没有melting之类的变化，最早的记录也会lost，言外之意是lost的大多数原因是planet自身发生的变化。

3楼 | 2023-10-24 20:40:28 回复

247181ktq

On the surface, that the geological record of the earliest history of impacts on the terrestrial planets has been lost, is troubling. As the process is self-erasing, to a certain extent, the earliest record would have been lost even if processes of melting and internal evolution of the planets had not occurred. 文中说因为这个过程是self-erasing的，所以早起的record 就会lost尽管没有行星的这些内部进化过程，文中说哪个可以推断出可以解释缺乏早期record。尽管没有行星自身的变化，record也会消失，意思是不是行星自身的变化也能解释record 的消失

2楼 | 2023-10-07 12:35:01 回复

217180xgg

什么啊，没看懂这题问什么···

1楼 | 2022-10-22 15:45:51 回复

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