Question

n what type of plate boundary did new crust form?

Answer 1

New crust forms at divergent (constructive) plate boundaries — especially mid-ocean ridges. Plates move apart, mantle material rises and melts; the magma cools to produce new (typically basaltic) oceanic crust. Evidence includes magnetic striping and progressively older crust away from the ridge (e.g., the Mid‑Atlantic Ridge, East Pacific Rise).