Currently our continents are move about 1-2 inches towards each other every year. over the course of many years we could end up colliding with other contries which would cause new mountain ranges and another supercontinent.
Was it the size? I thought I heard it once but I'm not really sure.
Extraterrestrial bodies, specifically the stars
Meteor Crater is the origin of large craters on Earth as meteor crater in Arizona.
~Hope this helps!
