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.

the answer is b. 300t + 3/2xt

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