Plate Tectonics Mountain Building The Worlds Mountain Ranges

Plate Tectonics & Mountain Building

The World’s Mountain Ranges Himalayas Rockies Alps Andes Alpine-Himalayan Belt Circum-Pacific Belt

Plate Tectonics Structure of the Earth

Structure of the Earth § § § Crust Mantle Core Lithosphere = Crust + Upper Mantle Asthenosphere Lower Mantle : convection currents of magma

Plate Tectonics Plates and Plate margins

The World’s major Plates North American Plate Eurasian Plate African Plate Indo-Australian Australia Plate Pacific Plate South American Nazca Plate

Plates movements & Plate margins How do the plates move? Diverging; Converging; lateral movement Plate margins: Diverging/Constructive plate margin Converging/Destructive plate margin Conservative/Passive plate margin

The lithosphere and the asthenosphere Lithosphere Asthenosphere

Constructive Plate Margin : Oceans Oceanic Ridge Magma thrusts up Rifting/faulting Tw o p late s m ove apa rt

Mid-Atlantic Ridge Indian Ridge

Constructive Plate Margin: continent Lava intrusion and extrusion Plate movement Displacement of rock strata under normal faulting

East African Rift Valley System

Oldoiyo Volcano, E. African Rift Valley

Destructive Plate Margin Sea Trench Rising magma n o c e t lates p n r e o i i v t a c e u H Subd o pdladown eze squ. Tew Melting e of crust g r ve

Sea Trenches

Passive Plate Margin San Andrea’s Fault

San Andrea’s Fault

Plate Margins & Ocean Floors