hi-yah I'm here today to talk to you through your plates boundaries there are three types of playgrounds that you must know the first is destructive also known as a convergent plate boundary the second is a constructive also known as a divergent plate boundary and the third a conservative also known as a transform plate boundary so first up is a destructive plate boundary that a stripling plate boundaries form where two plates are moving towards one another now driven by convection currents in the mantle oceanic plate which is more dense moved towards the continental plate which is less dense now the oceanic plates abducts or moves below the continental plates is more dense and heavier forming what is called a subduction zone now the subducting crust is subject to friction increasing pressure and heat causing the plate to mount so as these plates grind together through the process of subduction earthquakes can result due to the high pressure and large release of seismic energy now the area that this occurs in is called the benefits own the melting of plates produces magma which in turn finds its way back to the surface over time creating magma chambers and volcanic mountains and fold mountains can also occur along these boundaries as the continental crust is crumpled up as it moves above the oceanic plate second is a constructive plate boundary net constructive plate boundary Dakar where two plates are moving apart from one another in opposite directions now as these plates move apart cracks and fissures form in the gap allowing magma to push through the highly pressurized interior of the earth and the magma that fills this gap rises to the surface spreads and cooled to solidify and produce the new land now a good example of this process is found along the mid-atlantic ridge finally you have conservative plate boundaries the conservative plate boundaries form where two plates are moving alongside one another either in the same direction or in opposing directions now as the plates move alongside remember that they grind on one another and because sometimes get locked together now over time a buildup of pressure occurs which when released sends strong seismic waves through the Earth's crust causing very strong earthquake now a good example of this boundary is the san andreas thought as you can see in front of you whilst a good example of an earthquake occurring on this boundary would be the Christchurch earthquake of 2011