Question

landforms created divergent boundary

Answer 1

Divergent plate boundaries (where plates pull apart) create distinctive landforms by tensional stress, normal faulting and upwelling of mantle material that produces new crust. Key landforms and features:

Oceanic divergent boundaries
- Mid‑ocean ridges — long underwater mountain ranges formed as upwelling mantle melts and new basaltic crust is emplaced along the spreading center (e.g., Mid‑Atlantic Ridge, East Pacific Rise).
- Rift valley along the ridge axis — a central down-dropped trough at many ridge crests where plates separate.
- Pillow lavas and basaltic lava flows — characteristic submarine lava morphology and composition.
- Hydrothermal vent fields (black smokers) — hot, mineral‑rich fluids vent where seawater circulates through new crust.
- Fracture zones and transform faults — offsets of the ridge created by lateral motion between spreading segments.

Continental divergent boundaries (continental rifting)
- Rift valleys — large linear troughs bounded by normal faults (e.g., East African Rift); often contain lakes and volcanic cones.
- Horsts and grabens — alternating uplifted blocks (horsts) and down‑dropped blocks (grabens) produced by normal faulting.
- Fissure and flood basalt eruptions — widespread basalt plateaus can form in early rifting stages.
- Volcanism and geothermal activity — basaltic volcanoes, hot springs, and geothermal fields.
- Progressive opening to a sea/ocean — rifts can evolve into narrow seas (Red Sea) and eventually full ocean basins with passive continental margins.

Examples: Mid‑Atlantic Ridge, East Pacific Rise, East African Rift, Red Sea.