Ocean crust is formed at which plate boundary?

Ocean crust is formed at which plate boundary?

• A. Divergent boundaries
• B. Convergent boundaries
• C. Transform boundaries
• D. Subduction zones

Answer: (A)

Ocean crust forms where plates move apart at spreading centers. As the gap opens, mantle rock rises, partially melts, and erupts as magma that cools to become new oceanic crust on the seafloor. This ongoing creation at mid-ocean ridges builds and refreshes the ocean floor. At convergent boundaries, especially where oceanic crust is involved, the crust is typically pulled back into the mantle (subduction) and recycled rather than formed. Transform boundaries involve plates sliding past each other with little to no new crust being created. Subduction zones are a specific type of convergent boundary where crust is consumed, not formed.

Ocean crust forms where plates move apart at spreading centers. As the gap opens, mantle rock rises, partially melts, and erupts as magma that cools to become new oceanic crust on the seafloor. This ongoing creation at mid-ocean ridges builds and refreshes the ocean floor.

At convergent boundaries, especially where oceanic crust is involved, the crust is typically pulled back into the mantle (subduction) and recycled rather than formed. Transform boundaries involve plates sliding past each other with little to no new crust being created. Subduction zones are a specific type of convergent boundary where crust is consumed, not formed.