In the Age of Ultron, vibranium seems to be placed in strategic locations underneath the city of Sokovia, so that a massive segment of earth is enclosed in some sort of force field defined by the vibranium locations. Then that massive segment of earth is somehow lifted high into the sky, so that it can be dropped as if it were a massive meteor. But this plan is dashed because Tony and Thor are somehow able to collaborate, with F.R.I.D.A.Y.'s guidance, to reverse the effect of the vibranium, so that the large segment of earth is blown to bits before it lands on the planet surface.
How does this work?
What is the force field being generated around the vibranium? How does the forcefield work? How is the large segment of earth being lifted into the sky? And what do Tony and Thor do to cause the forcefield to collapse?