What kind of boundary does symmetry usually represent?

• A. Divergent boundary
• B. Transform boundary
• C. Convergent boundary
• D. Passive boundary

Answer: (A)

Symmetry around a boundary signals that crust is being stretched and created in opposite directions from the boundary. That pattern is typical of divergent boundaries, where plates move apart and new lithosphere forms on both sides, for example at mid-ocean ridges or continental rift zones. You can see mirrored features on either side as new material cools and the seafloor ages move away from the boundary in both directions.

Transform boundaries, by contrast, involve plates sliding past each other laterally, producing offsets rather than mirrored growth. Convergent boundaries bring one plate toward another, often with subduction or intense deformation, which creates asymmetric features like trenches and mountain belts. Passive margins aren’t active boundary zones, so they don’t generate the kind of symmetrical spreading pattern seen at divergent boundaries.