Daily Review #4 9. Put in order of age: Gondwana, Pangaea, South America 10. Sketch the layers of the Earth and label the asthenosphere, lithosphere,

Daily Review #1

Daily Review #4Put in order of age: Gondwana, Pangaea, South AmericaSketch the layers of the Earth and label the asthenosphere, lithosphere, outer core, inner core, mantle and crustDescribe the 4 different pieces of evidence to support continental driftHow does convection cause a plate to move?Look at the west coast of North America on your plate tectonics map. What do you think it will look like in 5 million years? Why?

End2 minutesEndPlate TectonicsMovementcm/yrMeasured by GPSInteract at boundaries 3 typesCollideSeparateSlide pastEarthquakes can occur at all

Plates are moving at varying rates, average of cm/yearWe can now measure this measure using GPS from several locations throughout the worldBoundaries: collide = convergent, separate = divergent, slide past = transform; find examples on map

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ConvergentBoundaryPlates collideContinental-continentalCreate mountainsExamples

http://indiandefence.com/threads/atlantis-was-indus-valley-plateu.45878/3 types of convergent boundaries based on types of crust of colliding platesContinental continental: example = India into Eurasian plate, a plate will subduct, but other buckles upward forming mountain ranges; creating the Himalayas todayContinental oceanic: example = Pacific and North American plates in places, creates a subduction zone and trench as ocean crust sinks because it is more dense, oceanic crust is melted and recycled in the mantle, can also create volcanoesOceanic and oceanic: example = Pacific and Australian plates, one of them subducts

3Convergent BoundariesSubduction Zone and TrenchOccurs atOceanic-oceanicOceanic-continentalSubductionMore dense plate sinksOceanic Older plateCreates a trenchMelts to produce magmaPlate recycledSome magma rises to form volcano

4As rock subducts subjected to higher temperature and pressure, releases water from crust, mixes with rock, lowers melting point, causing it to form magmaStart Mariana trench video at around 6 min.Explosive VolcanoesCommon near convergent boundariesRareDestructiveProduce clouds ofDebrisAshGasExamplesNW U.S.PompeiiKrakatoa

5Ash molten rock blown into dust-sized particles that harden in the airCan blast millions of tons of lava and rock in a single explosion in seconds

6Pyroclastic FlowsExplosive eruptionProduced in small amounts of time, large amounts of materialLaharFaster than a hurricaneTemperatures greater than 700 deg. CelsiusDeadly

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