Ajutorrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrrr

curanți magmatici ascendenți = 2
scoarța = c
rift = a
dorsale = d
subductie = b
curenți magmatici descendenți = 1