Along divergent plate boundaries, magma formation takes place typically due to:
a) melting of the plates as they move apart as a result of frictional heating
b) increased pressure from plate movement
c) pressure being reduced (decompression melting) as the plates move apart
d) water being released under pressure which lowers the melting temperature of the overlying asthenosphere
e) hot spots, which always occur along divergent boundaries
Answer: c) pressure being reduced (decompression melting) as the plates move apart
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