Imagine that you discover a new continent. On the west coast of the continent you further discover a chain of volcanoes running parallel to shore. What may you conclude about local tectonics?

The Oceanic plate crust is converging with the continental crust along the west coast

Explanation:

The example of the ocean and the continent convergence as the crust which is denser gets subducted into the mantel and this occurs along the trenches and is a part of the volcanic coastal mountains like those of the Pacific and the North American plate. Formation of the destructive plate margin as convergence boundary.