At these depths the temperatures are high enough to cause melting and the generation of magma--which can on the convergent plate boundaries be of almost any composition.
(the temperatures; are; high enough to cause melting and the generation of magma; L:At these depths) (the temperatures; to cause; melting and the generation of magma) (the generation of magma; can be; of almost any composition)
the temperatures the temperatures the generation of magma
are to cause can be
high enough to cause melting and the generation of magma L:At these depths
melting and the generation of magma
of almost any composition