Which boundary involves two high density plates that form deep narrow trenches along the boundary?

The options of the question are, A) oceanic-continental convergent boundary. B) A) oceanic-oceanic convergent boundary. C) divergent boundary. D) transform boundary.

The correct answer is A) oceanic-continental convergent boundary.  

The boundary that involves two high-density plates that form deep, narrow trenches along the boundary is an oceanic-continental convergent boundary.  

When tectonic plates collide create convergent boundaries. It happens when oceanic plates or continental plates meet. There are three kinds of convergent boundaries: oceanic-continental convergent boundaries, oceanic-oceanic convergent boundaries, and continental-continental convergent boundaries.

it was certainly a debatable decision, mainly because it was based primarily on political - and not on legal or social - views. since the congress at that time was led by members of the republican party, and the territory that the tribes wanted to turn into an exclusively indian state was predominantly democratic, the proposal (as expressed in the constitution) did not succeed, but the constitution itself proved to be of crucial importance in the creation of the state of oklahoma, and, most importantly, it guaranteed the involvement of representatives of the indian tribes in the government of the future joint state.  

as a member of congress, i would have voted to ratify the constitution, or at least to have it tabled. ignoring it was an interested and partial decision.  

sorry but all i can say is an empire is bigger than a