What causes magma to form at a convergent plate boundary?

Answer 1

The first sort of plate boundary is called a divergent boundary, or spreading center. At these boundaries, two plates move away from one another. As the two move apart, mid-ocean ridges are created as magma from the mantle up wells through a crack in the oceanic crust and cools. This, in turn, causes the growth of oceanic crust on either side of the vents. As the plates continue to move, and more crust is formed, the ocean basin expands and a ridge system is created. Divergent boundaries are responsible in part for driving the motion of the plates.

Answer 2

Magma is generated along the convergent plate boundaries as slab sinks into the mantle and, the increased temperature and pressure drives volatiles from the oceanic crust. These mobile fluids migrate upward into the wedge-shaped piece of mantle located between the sub ducting slab and overriding plate. Once the sinking slab reaches a depth of 100 km, these water rich fluids reduce the melting point of hot mantle rock sufficiently triggering some melting. And these partial melting of the mantle is what generates magma.

Answer 3

the mid ocean ridges cause the magma to form at a convergent plate boundary.

Answer 4

At a divergent plate boundary the crust is thin. This reduces pressure on the upper mantle, lowering the melting point and allowing some rock to melt.

Answer 5

At divergent boundary, the crust is thin hence reduces the pressure on the upper mantle therefore lowering the melting point and allowing some rock to melt.