Presentation on theme: "SC.912.e.6.1 Describe and differentiate the layers of Earth and the interactions among them."— Presentation transcript:
1 SC.912.e.6.1Describe and differentiate the layers of Earth and the interactions among them.
2 Earth Structures - The scientific theory of plate tectonics provides the framework for much of modern geology. Over geologic time, internal and external sources of energy have continuously altered the features of Earth by means of both constructive and destructive forces. All life, including human civilization, is dependent on Earth's internal and external energy and material resources.
3 9.5 Mechanism of Plate Motion Chapter 9: Plate TectonicsOnline Field TripsChapter QuizStudy Guide Summary (PowerPoint presentation)Web Quest: What if Pangaea Had Never Broken Up?Web ResourcesContinental Drift: Links on continental driftActions at Plate Boundaries: Links on plate boundariesAnimations
4 Earth’s FormationThe four layers are the inner core, outer core, mantle, and crust.inner coreouter coremantlecrustlithosphereasthenosphereInner Core• solidOuter Core• liquid
5 Earth’s FormationThe four layers are the inner core, outer core, mantle, and crust.inner coreouter coremantlecrustlithosphereasthenosphereMantle• solid with liquid propertiesCrust• solid
6 Earth’s FormationThe four layers are the inner core, outer core, mantle, and crust. The crust and top of the mantle are further classified by their properties into the lithosphere and the asthenosphere.inner coreouter coremantlecrustlithosphereCrustLithosphereasthenosphereMantleAsthenosphere
7 Describe the mechanisms of plate motion. DAY 2Mechanisms of Plate MotionDescribe the mechanisms of plate motion.What drives the slow movement of the plates and the convection in the mantle?
8 Mechanisms of Plate Motion Causes of Plate MotionMechanisms of Plate Motion Scientists generally agree that convection occurring in the mantle is the basic driving force for plate movement.Convective flow is the motion of matter resulting from changes in temperature.
9 Mechanisms of Plate Motion Causes of Plate MotionMechanisms of Plate Motion Slab-Pull and Ridge-PushSlab-pull is a mechanism that contributes to plate motion in which cool, dense oceanic crust sinks into the mantle and “pulls” the trailing lithosphere along. It is thought to be the primary downward arm of convective flow in the mantle.Ridge-push causes oceanic lithosphere to slide down the sides of the oceanic ridge under the pull of gravity. It may contribute to plate motion.
10 Plate Tectonicsslab pullA force at a subduction boundary that the sinking edge of the subducting plate exerts on the rest of the plate.
11 Plate Tectonicsridge pushA force that is exerted by cooling, subsiding rock on the spreading lithospheric plates at a mid-ocean ridge.
12 Mechanisms of Plate Motion Causes of Plate MotionMechanisms of Plate Motion Mantle ConvectionMantle plumes are masses of hotter-than-normal mantle material that ascend toward the surface, where they may lead to igneous activity.The unequal distribution of heat within Earth causes the thermal convection in the mantle that ultimately drives plate motion.
13 Plate Tectonicsmantle convectionA process by which heat from Earth’s inner and outer cores is transferred through the mantle.
15 Causes of Plate Movement Plate TectonicsCauses of Plate MovementVOCABULARYand slab pull are hypothetical models for the causes of plate movements.Mantle convection,ridge push,mantle convectionridge pushslab pullMantle convectionThis image shows one model of how mantle convection may contribute to plate movement.Mid-ocean ridgeDeep-sea trenchThis image shows as section of the East Pacific Rise, a mid-ocean ridge.
16 Slab- Pull: where the descending slab pulls on the plate Describe the mechanisms of plate motion.What drives the slow movement of the plates and the convection in the mantle?Slab- Pull: where the descending slab pulls on the plateRidge-Push: Force of gravity causing the cold lithosphere to move away from the ridge by sliding down over the asthenosphere, which gets more elevated toward the ridgeMantle-Convection: motion caused by flow of hot, less dense material upwards and cold, more-dense material downwardThe unequal distribution of heat with Earth’s interior drives plate motions
17 Create a table for Causes of Plate Motion include; Day 3Create a table for Causes of Plate Motion include;personal definition andillustration for each motion