earth quakes
An earthquake!!
plate tectonics=D
Volcanoes don't help plate tectonics; volcanoes are the result of plate tectonics.
the crust cracks and magma fills in the space
Nope plate tectonics do not exist on Venus.
an earthquake
No, since they are composed strictly of gases and have no land to shift.
Plate tectonics on earth are vigorous and ongoing. Plate tectonics on Mars are a matter of debate. Long thought to be only in Mars distant past, there is a shift in opinion on the question of plate tectonics on Mars, and some (not all) scientists now believe that there is mild and sporadic plate tectonics happening on Mars to this day. But all agree that if that is the case, it is a fraction of those happening on earth.
An earthquake!!
an earth quake
plate tectonics=D
Earthquakes
Volcanoes don't help plate tectonics; volcanoes are the result of plate tectonics.
Plate tectonics
the crust cracks and magma fills in the space
First, it's 'What ARE plate tectonics' as there as more than one. and Plates UNDER the earth's crust that shift. I can't tell you what they do though...
Plate Tectonics