Landforms (Relief Features) associated with plate boundaries ? ? ?

Constructive Plate Boundary – initial stage Rift Valley e.g. East African rift valley

Initial doming from upwelling magma Leads to Y-shaped rifting. Rift Valley with stepped faults, and tilted blocks (horsts)

A shallow sea basin may form – lots of evaporite salt deposits. Middle Stage

Later stage Mid ocean ridge created by sea floor spreading. Magnetic stripes as evidence for the spreading. Fissure volcanoes e.g. Iceland

Underwater mountain range Central rift valley Offset by transform faults

Destructive Plate Boundary – type 1 Ocean plate v. Ocean plate Ocean trench e.g. Aleutian trench Island arc volcanoes e.g. Aleutians (off Alaska)

Pacific Ring of Fire

Destructive Plate Boundary – type 2 Ocean plate v. Continental plate (Sometimes called a SUBDUCTION ZONE) Ocean plate subducts as it is denser Ocean trench e.g. Peru-Chile trench Cordillera range of Young Fold Mountains e.g. Andes Andesitic volcanic peaks e.g. Nevada del Ruiz

Destructive Plate Boundary – type 3 Continental plate v. continental Plate collision A collision zone Major fold mountains e.g. Himalayas and High Plateau e.g. Tibet e.g. Ocean plate carrying India drifted northwards until India collided with Eurasian plate.

Conservative Plate Boundary No volcanic features Plenty of earthquakes e.g. San Andreas fault. Fault line scarp slopes Horizontal movement faults

Fault displacement features

Conservative Plate Boundaries are transform faults which displace mid ocean ridges in Constructive plate Boundaries Transform fault Mid ocean ridge