In subduction zones, magma formation takes place typically due to:
a) melting of the subducting plate as a result of frictional heating
b) increased pressure from plates colliding
c) pressure being reduced (decompression melting)
d) water being released under pressure which lowers the melting temperature of the overlying asthenosphere
e) hot spots, which always occur along subduction zones
Answer: d) water being released under pressure which lowers the melting temperature of the overlying asthenosphere
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