thermal convection
Geothermal Drift.
In the middle of the ocean is a rift where the ocean floor squeezes out lava and pushes the ocean plates apart.
thermal convection
the primary force that causes the seaffloor to spread and contienents to drift
Tectonic plate movements or plate shifting.
Radiologyinfotation
thermal convection is the primary force that cause the sea floor to spread
rising molten magma
Tectonic.
It would have to be continental drift because the plates are moving in the lithosphere causeing the magma to come up 7 killometers from the groundThe answer is simply Thermal convectionI dont know what it is but it is not that. I am doing a word cross puzzle and it says it is 17 lettersThe correct answer for your crossword puzzle is thermal convectionCheesecakeshes right:) the cheesecake person also doin a crossword puzzel
Earthquakes
Plate Activity causes it to move.