Which coastline type lies along the edge of a convergent plate and is associated with tectonic activity?

• A. Collision coasts
• B. Trailing-edge coasts
• C. Marginal sea coasts
• D. Open coasts

Answer: (A)

Collision coasts form at convergent plate boundaries where two continental plates collide. The squeezing and uplift at these boundaries raise land directly along the edge of the plate, creating rugged, tectonically active coastlines shaped by earthquakes and mountain-building processes. That association with active tectonics at the plate edge is what makes collision coasts the correct choice. In contrast, trailing-edge coasts occur at passive margins with little tectonic activity; marginal sea coasts lie around seas within a plate, and open coasts are not defined by a specific tectonic setting.