The main way water mainly gets into a subduction zone is by:
a) heating of the overlying continental crust
b) a decrease in pressure that causes melting
c) rain associated with eruptions in the island arc
d) seawater introduced into oceanic crust at the mid-ocean ridge, prior to subduction
e) all of the above
Answer: d) seawater introduced into oceanic crust at the mid-ocean ridge, prior to subduction
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