Convergent boundaries are found in places where two plates move towards each other.
Continental-oceanic convergent is a type of convergent boundary which is formed if one plate which has an oceanic crust on the top movers toward another plate which has a continental crust on the top.
In the given scenario the Nazcaplate is topped by the oceanic crust whereas the South American plate is topped by continental crust and as they move towards each other continental-oceanic convergent plate boundary is formed.
<em><u>A convergent boundary</u></em> is a type of boundary where two plates collide and push against one another.
<em><u>A continental-oceanic convergent</u></em> is a type of convergent boundary that occurs as a result of <em><u>subduction.</u></em> <em><u>Subduction occurs where a continental plate collide thus resulting to the oceanic plate being pushed underneath the continental plate</u></em> into the mantle since the oceanic plates are much thinner.
The result is that <em><u>the oceanic plates melts into hot magma which that burns its way up through the continental plate</u></em> forming a volcano and also causing earth quakes.
