Which boundary involves two plates sliding past each other horizontally?

• A. Convergent Boundary
• B. Transform Boundary
• C. Divergent Boundary
• D. Oceanic-Oceanic Boundary

Answer: (B)

Transform boundaries are where two tectonic plates slip past each other along a boundary, moving horizontally relative to one another. The motion is shear, which commonly produces earthquakes along strike-slip faults like the San Andreas Fault. This horizontal sliding distinguishes transform boundaries from others where plates push toward each other (convergent) or pull apart (divergent). An oceanic-oceanic boundary is a specific case of convergence between two ocean plates, often involving subduction, not a pure horizontal slide. So the boundary that involves two plates sliding past each other horizontally is a transform boundary.