Rifting Sometimes Stops After an Initial Period of Faulting and Volcanism

question 16

Multiple Choice

Rifting sometimes stops after an initial period of faulting and volcanism:

• A) because the asthenosphere convection current ceases.
• B) but it is not known why such rifting ceases.
• C) because the position of other plates stops further movement.
• D) because the asthenosphere convection current is too weak to move the plates further.