its actually more like billions of years.
like 4 billion.
so you don't need to worry about the world ending.
also not every rock will burn up, it depends on its size and density
Of course it does, but normally it burns in the atmosphere to a small rock if the rock's density and size is big. For me to penetrate the atmosphere and go through it conserving it's size a meteor needs to be like the size of the many big meteors that killed the dinosaurs millons of years ago.
Hey, I just thought of something. If a giant meteor, or some other kind of catastrophe ended the dinos with a mass extinction..doesn't mean we technically live in a post apocalyptic world? Just sayin'.