Chapter 17Chapter 17Plate TectonicsPlate Tectonics

Part 2Part 2

Plate InteractionsPlate Interactions

We have two different types of crustWe have two different types of crust OceanicOceanic ContinentalContinental

We have three different types of We have three different types of boundaries.boundaries. Convergent – plates coming togetherConvergent – plates coming together Divergent – plates moving apartDivergent – plates moving apart Transform – plates slide past each otherTransform – plates slide past each other

Plate boundariesPlate boundaries

Convergent boundariesConvergent boundaries

Convergent boundariesConvergent boundaries

Oceanic - OceanicOceanic - Oceanic Pacific plate colliding with the North American Pacific plate colliding with the North American

plateplate Aleutian Islands are formingAleutian Islands are forming

Aleutian IslandsAleutian Islands

Aleutian IslandsAleutian Islands

Aleutian IslandsAleutian Islands

Convergent boundariesConvergent boundaries

Continental – ContinentalContinental – Continental Indian plate colliding with the Eurasian plateIndian plate colliding with the Eurasian plate

Himalayas are formingHimalayas are forming

HimalayasHimalayas

HimalayasHimalayas

HimalayasHimalayas

Convergent boundariesConvergent boundaries

Oceanic – ContinentalOceanic – Continental Nazca plate colliding with South American Nazca plate colliding with South American

plateplate The Andes mountains are formingThe Andes mountains are forming

Andes MountainsAndes Mountains

Andes MountainsAndes Mountains

Andes MountainsAndes Mountains

Andes MountainsAndes Mountains

Divergent boundariesDivergent boundaries

Oceanic – OceanicOceanic – Oceanic North American plate and the African plateNorth American plate and the African plate

Mid-Atlantic ridgeMid-Atlantic ridge

Mid Atlantic RidgeMid Atlantic Ridge

Mid Atlantic Ridge @ IcelandMid Atlantic Ridge @ Iceland

Divergent boundariesDivergent boundaries

Continental – ContinentalContinental – Continental African plate splitting apart near UgandaAfrican plate splitting apart near Uganda

East-African riftEast-African rift

East African RiftEast African Rift

Continental Rift ZoneContinental Rift Zone

Lake TanganyikaLake Tanganyika22ndnd deepest lake in the World (4800 ft) deepest lake in the World (4800 ft)

Lake TanganyikaLake Tanganyika

Victoria FallsVictoria Falls

Great Rift ValleyGreat Rift Valley

Great Rift ValleyGreat Rift Valley

Transform boundariesTransform boundaries

Pacific plate and the North American platePacific plate and the North American plate San Andreas faultSan Andreas fault

CaliforniaCalifornia

San Andreas FaultSan Andreas Fault

San Andreas San Andreas FaultFault

High altitude view

Causes of Plate MotionCauses of Plate Motion Convective currents cause plate movement.Convective currents cause plate movement.

Causes of Plate MotionCauses of Plate Motion Ridge push and slab pull also contribute to plate motion.Ridge push and slab pull also contribute to plate motion.