Answer:
Part of this border follows a natural boundary.
Explanation:
The answer is this one because Its a natural line between texas and Mexico and there are no mountains
They are formed by subduction
I believe the plates are called the south American plates just saying I might be correct or I might be wrong so don't take my word for it I am not the expert
Well its all due to Green house gasses produced through factories and automobiles, with the abundance of the world, driving, fly, and burning gas and oil on the whim we are playing a major role in this and unless a new technology that can surpass oil and natural gas we are slowly killing ourselves and the world.