Where convection currents push plates together, destructive plate boundaries (margins) are formed. Constructive plate margins close constructive plate marginAn area where two tectonic plates are ...

Exactly what drives plate tectonics is not known. One theory is that convection within the ... Whatever drives the movement, plate tectonic activity takes place at four types of boundaries ...

The researchers theorize that these far-off remnants could either be deposits of silica-rich material that have hung around ...

"This study clearly demonstrates horizontal plate movements before 3 ... that early Earth had less-developed convection ...