how do natural replenishment of soil take place

Worms eat stuff and crap it out, then die. So do lots of other things and leaves fall and plants die. Etc.

Rocks crumble into tiny particles. Volcanic dust settles on the ground in some places. And in unlucky situations, a meteor falls from space and rains debris.

Umang, Con right of course but Seac funnier

It takes a long time from changing weather patterns, animals, insects and vegetation.