What is the name of the single landmass before it broke apart?

What is the name of the boundary where two plates move away from each other?

What is the name of the scientist who proposed this theory?

What is the name of the boundary that most commonly causes fault lines and earthquakes?

What year was this theory made?

What is the name of the boundary that causes mountains to form?

What is the name of the event where the continents started to drift apart?

What is the reason for why one plate would fall under another plate in a convergent boundary?