A Destructive or Convergent tectonic plate boundary is one where two of the Earths plates are moving towards each other.
If one of the plates is Oceanic and the other is Continental then the heavier Oceanic plate will sink and subduct under the Continental plate. The plate will sink into the subduction zone where the material is melted by the heat from the mantle, this hot magma rises to the crust and flows out through cracks in the crust. The ash and larva produced cools to form layers which build up to make a Composite volcano.
Also as the Oceanic plate is subducting under it can get stuck to the Continental plate, this causes masses of tension to build up as both plates are now unable to move. After a while this is released and the Continental plate springs back up. The release of tension causes Earthquakes and Tsunami's by sending out Seismic waves.
But if both plates are Continental/Oceanic are are therefore the same mass, then they will push together and crumple to form fold mountains.
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