OCR-A AS Plate tectonics Convection currents.

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Presentation transcript:

OCR-A AS Plate tectonics

Convection currents

Internal structure

Plate margins

Types of margins Types of Margins

1. Constructive Boundaries

Magnetic banding

(I) Constructive Ocean+Ocean Plate eg Mid Atlantic Ridge (North American + Eurasian Plate)

Iceland rift

Thingvellir, Iceland

(II) Continental+Continental Plate Eg East African Rift Valley (African and Indian Plate)

2. Destructive Boundaries

Pacific Ring of Fire

(I) Ocean+Continental Plates - eg Peru, Andes (eg Nazca and South American Plates)

Andes

(ii)Ocean + Ocean Plates Eg. Marianus Trench (Pacific and Philippine Plates)

(iii) Continental+Continental Eg Himalayas, Nepal (Indian+Eurasian Plates)

Tibetan plateau

3. Transform Boundaries

Eg. The San Andreas Fault, California, USA

Off-set Highway on the San Andreas Fault

Valleys along the fault line

Gap theory

Hot spots Plumes of hot mantle rising to the surface

Hot Spots > a small area of the earth’s crust where an unusually high heat flow is associated with volcanic activity

World Hot Spots

The Trail of Hot Spots

Any Questions…….