Q. Consider the following pairs:

1. Transform boundary – The San Andreas Fault in California
2. Divergent boundary – Mid-Atlantic Ridge
3. Oceanic-continental convergent plate boundary – the Washington-Oregon coastline of the United States
4. Oceanic-oceanic convergence – Mariana Trench

How many pairs given above are correctly matched?
Answer: Only 4 pairs
Notes: All four pairs are correctly matched. The San Andreas Fault is a classic transform boundary; the Mid-Atlantic Ridge is a divergent boundary; the Washington-Oregon coastline exemplifies oceanic-continental convergence (Juan de Fuca Plate subducts beneath North America); and the Mariana Trench is formed by oceanic-oceanic convergence (Pacific Plate under Philippine Plate).