Does anyone know a process that can alter the structure of the Earths mantle?

Answer 1

Plate tentonics.

"Because the earth is very hot inside, a current of heat flows from the core to the crust. This is called convection current and it also takes place in the mantle. This current cools down as it comes closer to the surface of the earth. As a result, the rising of the current decreases and goes into horizontal direction along the bottom of the crust. When the current cools down more, the convection current descends again and goes to the inner earth. There the temperature increases and the current rises again. This goes on and on.

When the current comes at a weaker part of the crust, for example at a volcano, magma comes above the earth's surface. The convection current along the bottom of the crust causes the moving of the tectonic plates. This is called "plate tetonics."

,read about plate tetonics here:
http://mediatheek.thinkquest.nl/~ll125/en/platetec.htm

Answer 2

Tectonic movement, overlapping and slowing of the earths rotation, and cooling of the earths core. All these are a result of time and age.

Answer 3

Yea call in the borg battle fleet! It would take astronomical amounts of energy

Answer 4

Probably collision with an asteroid or more likely thermo-nuclear war.

Answer 5

an acceleration of the earths rotation or a black hole

Answer 6

if iknew i wouldnt tell..coz some crazy person might go and try it out

Answer 7

I think I would call it an earthquake.

Answer 8

God