A long narrow mountain range on the ocean floor formed by magma at divergent plate boundaries is known as what?

• A. Continental Drift
• B. Mid-Ocean Ridge
• C. Subduction
• D. Lithosphere

Answer: (B)

The main idea being tested is how new ocean floor and underwater mountain ranges form at places where tectonic plates move apart. At these divergent boundaries, magma rises to fill the gap, cools, and creates new crust. Over time this process builds a long, narrow underwater mountain chain that runs through the oceans—the mid-ocean ridge. This feature is the global system of underwater ridges where sea-floor spreading occurs. For context, continental drift refers to the movement of continents themselves, subduction involves one plate sinking beneath another and forming trenches and volcanic arcs, and lithosphere is just the rigid outer shell of Earth, not a specific landscape feature.