< p > <强>没有,离这有许多地球上的陨石坑。< /强> < / p > < p >我认为你问如果有许多地球上的陨石坑,但他们很难看到,因为植被和海洋。答案是“不”。主要原因是,由于< a href = " https://en.wikipedia.org/wiki/Plate_tectonics " rel = " nofollow noreferrer " >板块构造< / >——大多数的地壳明显年轻(数亿年)比表面说,月球(数十亿年):< / p > < p > < a href = " https://i.stack.imgur.com/P78kn.jpg " rel = " nofollow noreferrer " > < img src = " https://i.stack.imgur.com/P78kn.jpg " alt = "大陆地壳的时代" > < / > < / p > < p >海底是少于200 Ma老:< / p > < p > < a href = " https://upload.wikimedia.org/wikipedia/commons/f/f5/Earth_seafloor_crust_age_1996_-_2.png " rel = " nofollow noreferrer " > < img src = " https://upload.wikimedia.org/wikipedia/commons/f/f5/Earth_seafloor_crust_age_1996_-_2.png " alt = "海洋地壳的时代" > < / > < / p > < p >这可以解释更多的比你想象的区别,因为它认为火球几个数量级的影响比现在更频繁的十亿年前。有很多碎屑在早期太阳系!< / p >We also see this surface age effect on the moon itself: the mare (seas) are made of relatively young lava, and have many fewer craters than the older highlands:
Other than the age of the planet's surface, there are some secondary reasons why there are fewer craters on earth:
- The earth has an atmosphere, in which most particles — things that might make a crater on a planetoid without an atmosphere — break or burn up.
- The earth has water and weather, resulting in glaciers, frost, rain, and so on — this all acts to erase surface features through erosion.
This is not to say that things don't hit earth — they do, all the time. Just look at this map of recorded bolides over a recent 20 year period (Planetary Science, NASA, via Universe Today):
