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Earth crust and impacts

There is evidence that the earth is hosting extraterrestrial rocks but the difference to my hypothesis is that I think that lots of it is much younger than predicted could be even thousands of years and not millions proven by young Iridium traces found in many parts of the earth. Why don’t we find enough craters on earth like on moon although our earth has a stronger pulling power? 

it is because the older craters have been covered by younger once.

Here an article by the National Geographic tells a little bit about rocks that visited our planet and made changes in the earth crust;

Holdsworth and his colleagues had an inkling that the rotated layers and other curious features of the rock’s fractures might be the result of a precipitous plunge, but they needed more data to make the case. So Killingback took on the challenge for his master's thesis research.

More about this interesting story:

https://www.nationalgeographic.co.uk/science-and-technology/2020/10/in-what-is-today-scotland-before-plants-or-animals-existed-this