Complete the passage about the process of subduction. The subduction of [Blank 1] boundary often forms volcanoes. This phenomenon occurs because the underground pressure squeezes water out of the dense crust, and this water works its way into the mantle. The water [Blank 2] the mantle and allows for the creation of magma.

Blank 1 Options:
A: continental crust at a divergent
B: oceanic crust at a convergent
C: oceanic crust at a transform
D: continental crust at a convergent

Blank 2 Options:
A: heats up
B: lowers the melting point of
C: freezes and thaws in
D: washes away