You don’t do science much do you?
The chances of an asteroid strike is close to a certainty given a large enough time line. Your idea of the “magnetic wall” and the asteroid belt is hysterical.
Look up at the moon some time. That will give you a clue.
Earth would look JUST LKE it, if we didn’t have weather and techtonic plate activity.
If you hunt, look close, there are several remnants of ancient crater impacts scattered across the earth. Out near Winslow Arizona there is a big crater in the desert that is from a recent impact.
Rather than have you look, here they are with maps and everything
http://en.wikipedia.org/wiki/List_of_impact_craters_on_Earth
Agreed. And we’re damn lucky to have the moon where it is. It seemed to have blocked quite a few major impacts from hitting Earth as well.
Given enough time yes. But even then it still isn’t a certainty.