Where did we use the term tectonic plates in the previous lecture? What is the age of the earth?
What is tectonic plates? What are the different tectonic plates? What is the history of tectonic plates? Do the tectonic plates move? Briefly explain the movement of plates? What is continental drift? What is the evidence of continental drift?
CANZA, (Clue : The 4th theatre in Coimbatore is still kicking, Akka) AABRAIN (Clue : Dubaia, Bahraina, Sharjahava?) RICARBEAN (Clue : West Indies)
The lithosphere is divided into several slabs orblocks or plates. These plates are supported frombelow by Asthenosphere. These plates are calledLithosphere plates or Tectonic Plates.Some of these plates encompass continents, someof these plates encompass oceans and some of theplates encompass both oceans and continents.
The plates are divided into three categoriesPrimary PlatesSecondary PlatesTertiary Plates The primary plates and secondary plates are together called major plates. The tertiary plates are sub divisions of Primary and Secondary Plates
PrimaryAfrican PlateAntarctic PlateEurasian PlateIndo-Australian Plate (sometimes Indian and Australian)North American PlatePacific PlateSouth American PlateSecondaryArabian PlateCaribbean PlateCocos PlateJuan de Fuca PlateNazca PlatePhilippine Sea PlateScotia Plate
225 million years ago (Permian) PANGAEA200 million years ago (Triassic)LAURASIA, GONDWANA125 million years ago (Jurassic)NENA,COLUMBIA,ZEALANDIA65 million years ago (Cretaceous)LEMURIACURRENT150 million years laterAMASIA
The movement of tectonic plates is believed to be inducedby the asthenosphere which induces heat and convectioncurrents.The plates are capable of drifting with respect to each otheralong their plate boundaries.Based on the plate movement, there are 3 principal type ofboundaries namelyDiverging BoundariesConverging BoundariesTransform Boundaries
EXAMPLESDivergent BoundariesNorth American Plate & Eurasian PlateConvergent BoundariesSouth American Plate & Nazca PlateTransform BoundariesNorth American Plate & Pacific Plate near the JDF Plate
PLEASE NOTEWhen two continental plates diverge, a rift is created.Eg. East African RiftWhen two oceanic plates diverge, a ridge is created. SeaFloor Spreading is said to occur.Eg. Mid Atlantic RidgeWhen two oceanic plates converge, an island arc andtrench are created.When an oceanic and convergent plate converge, a volcanoand trench are created.When two continental plates converge, a mountain range isformed.
PLEASE NOTEWhen two continental plates or oceanic plates orcontinental/oceanic plates transform, ______PLATE MARGIN, ANY GUESSES?
Gostou de algum slide específico?
Recortar slides é uma maneira fácil de colecionar informações para acessar mais tarde.