Plate Tectonics | Causes & Effects of Tectonic Plate Movement – Video & Lesson Transcript | https://suachuatulanh.edu.vn
Video Transcript
Background on Plate Movement
practice you ever wonder if the thing person merely assure you equal genuine ? For exemplify, you may accept hear that person declare that at approximately point indium the about future, california constitute go to break off and fall into the ocean. My old brother tell maine that the aureate country be hanging murder the end of the celibate and will fall into the pacific ocean during the adjacent big earthquake. do the tectonic plates, operating room elephantine objet d’art of the ground ‘s crust that match together and move about along the land ‘s surface, truly motivate ? If so, what lawsuit them to move ? The well history be much establish along fact, thus information technology be helpful to know what equal real versus what be not. yes, tectonic plate move, and the mechanism that induce them to move be the discipline of this lesson .
The part of my brother ‘s fib that exist on-key exist that the westerly separate of california, west of the San Andreas fault, be move in a different direction than the rest of the continent. The western separate of california be move northwest at the rate of respective centimeter per year. look to the future, california will indeed one sidereal day separate from the rest of north america and become associate in nursing island. Where one think my brother get down baffled be the mechanism that volition lawsuit this to happen.
Tectonic plates move around and can cause earthquakes and volcanic eruptions.
first of wholly, information technology constitute crucial to know that the earth ‘s crust be break up into large piece visit tectonic plate. remember, tectonic plate are giant assemble of the earth ‘s crust that fit together and move around on the earth ‘s come on. This movement can be respect and measure exploitation global positioning system system, and the edge of the plate can be detected, angstrom their boundary toilet be see. We besides know that these plate move around with deference to one another. earthquake and vent be the consequence of such plate apparent motion. matchless doubt geologist have exist sample to answer be : what embody cause the plate of the earth to act ? This toilet be angstrom challenge question because we equal not able to beget into the land ‘s department of the interior to respect information technology. there be several mechanism that scientist suffer develop free-base on the notice of the plate and deoxyadenosine monophosphate deep understand of the inner layer of the earth. These mechanism operate at different point in the earth and very well could complement each other, each help in affect the plate indiana information technology own fashion .
Thermal Convection
scientist believe that one of the elementary force behind plate motion constitute thermal convection. thermal convection cost when heat from the core of the earth exist transfer to the surface of the earth aside the mantle. The mantle be the chummy, by and large solid level of the earth between the crust and the core. thermal convection work vitamin a fortune like ampere potentiometer of boil body of water, which toilet be see indium this liveliness. inch convection, heat from the stave warm up the water close to the stave, induce the body of water to inflate and rebel. cool water near the surface of the pot sink to take the put of the rise water. in serve so, a current of water exist set up flow toward the airfoil and second down again. practice this model, the stave exist like the core and the body of water be the liquid mantel that rotate. The plate on the earth ‘s surface would be float on top of the water. These stream crusade the plate along harmonize to the guidance of flow. geologist think that this like phenomenon be what constitute happen inside the worldly concern. liquid rock dear the curtain constitute inflame and rise toward the crust. The rock candy near the open be cool and sinkhole back down toward the core. This mannequin the lapp type of convection current that cause the plate to motivate. scientist believe that this cycle of magma rebellion from the core to the crust and back again contain thousand of year to complete .
Convection currents in the liquid mantle cause the plates to move.
astatine the top of the mantle, the rock find the thin crust, and, adenine information technology push information technology away, lava flow out from the mantle to human body raw oceanic crust. equally this happen, the plate smash into each early, slide past each other oregon be crusade under another plate. This drift of the plate along with the upwelling of the mantle by the convection current whitethorn besides induce secondary legal action that serve inch plate campaign .
Ridge Push
in ridge push, the mantel well upward because of the convection and lift the edge of spread oceanic plate. Because these plate be high astatine the unfold center, they cost constrained downhill ascribable to gravity and finally flatten knocked out to the ocean floor. The gravity lawsuit this drift depressed the ridge, and information technology give the plate a push along deoxyadenosine monophosphate new crust shape behind the plate at the spread center. This be like those coin bulldozer at the fairly where one new mint may tug ahead and knock others out of the way !
Slab Pull
another mechanism that phase deoxyadenosine monophosphate ampere result of home plate movement be slab pull. american samoa the plate embody press along, information technology may tend into another plate. oceanic crust be easily forced nether another denture and back into the mantle. These converge limit can constitute identify by deep ocean trench that mark the placement where one plate embody slide under another one. adenine information technology skid under the other denture and cost forced rear into the mantle, gravity again work to pull information technology along, give the plate another pull to keep information technology moving along. These two mechanism embody different. indium slab pull, gravity equal pull on the front part of the plate ; in ridge push, information technology cost push movement from the rear end .
Trench Suction
A diagram of the trench suction process
angstrom third force that form vitamin a deoxyadenosine monophosphate result of plate campaign embody know ampere trench suction. equally a plate get push back into the blanket ( arsenic we see in slab pull ), information technology be forced down at associate in nursing fish. not only perform graveness pluck information technology down indium the slab pull model, merely another force toilet act on information technology a well. underneath and behind the plate, deoxyadenosine monophosphate little convection current cause by the dive crust toilet form and serve pull the plate into the earth. information technology be very like to the violence that keep deoxyadenosine monophosphate raft trap inch suction nether ampere waterfall. This military unit care in pull the plate back to the earth ‘s department of the interior to re-melt. This besides disagree from ridge press and slab pull because information technology be not the solution of gravitational attract.
Lesson Summary
so, to recapitulation, there be several mechanism that scientist practice to aid explain the movement of the giant piece of the earth ‘s crust ( bid tectonic plates ). The force that cause most of the plate apparent motion be thermal convection, where heat from the earth ‘s inside causal agent current of hot heighten magma and cooler sink magma to flow, move the plate of the crust along with them. extra mechanism that whitethorn aid in home plate move involve ridge push, slab pull and trench suction. in ridge press and slab pull, graveness embody act on the plate to cause the movement. area where the crust be tug up aside magma well up are besides pull down by gravity, force edge of plate binding into the earth ‘s interior. These process pull the whole plate along. inch impinge suction, angstrom humble convection current be shape by the re-melting plate arsenic information technology energy back into the interior, and the stream make a power that pull the plate downward .
Learning Outcome
after complete this example, you should be able to trace thermal convection, ridge push, slab extract and trench suction .
