Plate Tectonics - Crafton Hills College
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
... 6) Polar Wandering: ancient poles were in different positions than the present poles. This can only be explained by: 1) Continents remained still and the poles moved 2) Poles were still and the continents moved (Reality: they both move) Wagener’s theory was not accepted. Why? ...
Testing the plate tectonics model Evidence for the plate tectonics
... Plate Tectonic Theory • Mid-ocean ridges – underwater mountain chains that circle the globe and often mimic the shape of the coastline • Distribution and depths of earthquakes and volcanoes • Relatively young age of the oceanic crust ...
... Plate Tectonic Theory • Mid-ocean ridges – underwater mountain chains that circle the globe and often mimic the shape of the coastline • Distribution and depths of earthquakes and volcanoes • Relatively young age of the oceanic crust ...
Material properties and microstructure from
... +7 ± 3 ppm relative to the modern convecting mantle in a 2.7 Gyr old tholeiitic lava flow from the Abitibi Greenstone Belt in the Canadian Craton. Our result effectively extends the early Archean convective mixing time to ~1.8 Gyr, i.e. even longer than present-day mantle mixing timescale [3], despi ...
... +7 ± 3 ppm relative to the modern convecting mantle in a 2.7 Gyr old tholeiitic lava flow from the Abitibi Greenstone Belt in the Canadian Craton. Our result effectively extends the early Archean convective mixing time to ~1.8 Gyr, i.e. even longer than present-day mantle mixing timescale [3], despi ...
Handout 10
... c. boundary between tectonic plates that are moving away from each other _____ 14. mid-ocean ridge d. undersea mountain range _____ 15. subduction zone e. the boundary between tectonic plates that are colliding 16. A narrow area that forms where the plates at a divergent boundary separate is called ...
... c. boundary between tectonic plates that are moving away from each other _____ 14. mid-ocean ridge d. undersea mountain range _____ 15. subduction zone e. the boundary between tectonic plates that are colliding 16. A narrow area that forms where the plates at a divergent boundary separate is called ...
Unit 5 – Structure of the Earth
... German geologist and astronomer, proposed that continents move • Pangaea – supercontinent formed when all of earth’s landmasses were joined • Scientists didn’t believe him for almost 50 years ...
... German geologist and astronomer, proposed that continents move • Pangaea – supercontinent formed when all of earth’s landmasses were joined • Scientists didn’t believe him for almost 50 years ...
Name________________________________________
... c. boundary between tectonic plates that are moving away from each other _____ 14. mid-ocean ridge d. undersea mountain range _____ 15. subduction zone e. the boundary between tectonic plates that are colliding 16. A narrow area that forms where the plates at a divergent boundary separate is called ...
... c. boundary between tectonic plates that are moving away from each other _____ 14. mid-ocean ridge d. undersea mountain range _____ 15. subduction zone e. the boundary between tectonic plates that are colliding 16. A narrow area that forms where the plates at a divergent boundary separate is called ...
Study Guide Answers
... Oceanic crust is denser so when it converges with the continental plate causes subduction. The oceanic plate melts and convection currents recycle it back to point A 5. What is the main cause for earthquakes and volcanoes? Plate tectonics, plate movement, one plate moving past another either by conv ...
... Oceanic crust is denser so when it converges with the continental plate causes subduction. The oceanic plate melts and convection currents recycle it back to point A 5. What is the main cause for earthquakes and volcanoes? Plate tectonics, plate movement, one plate moving past another either by conv ...
Earth and Space Science 2015 Semester 2 Exam Review Part 1 Convection
... along the fault can start an earthquake. Major fault lines can occur on or along plate boundaries. ...
... along the fault can start an earthquake. Major fault lines can occur on or along plate boundaries. ...
File - South Sevier High School
... larger continent. A classic example are the ___________________________ mountains that formed when India and Asia collided. 31. Mantle _________________ are narrow columns of hot mantle rock rise through the mantle and have the following characteristics: a. b. c. d. e. ...
... larger continent. A classic example are the ___________________________ mountains that formed when India and Asia collided. 31. Mantle _________________ are narrow columns of hot mantle rock rise through the mantle and have the following characteristics: a. b. c. d. e. ...
Plate Tectonics Test Review
... What is Sea Floor Spreading? What is the evidence that it is occurring? • Sea Floor Spreading: the process by ...
... What is Sea Floor Spreading? What is the evidence that it is occurring? • Sea Floor Spreading: the process by ...
the earth`s interior
... Ever since its formation—some 4.5 billion years ago—the earth has been losing heat. The deeper one goes inside the earth, the greater the temperature becomes. The pressure rises, too. The earth’s outer layer, or crust, is the coolest and least dense of all the layers inside the earth. (You might com ...
... Ever since its formation—some 4.5 billion years ago—the earth has been losing heat. The deeper one goes inside the earth, the greater the temperature becomes. The pressure rises, too. The earth’s outer layer, or crust, is the coolest and least dense of all the layers inside the earth. (You might com ...
... plates. Be sure to explain where the energy comes from to make this process happen. The inner core is so hot that it heats up the other layers. The “puttylike” layer of the asthenosphere slowly moves – as particles get heated from core they spread out & become less dense – and they rise. They then c ...
Rodinia supercontinent break-up: Not a result of Superplume tectonics
... caused development of orogens, melting anomalies and other thermal events under a compressional tectonic regime along continental margins. The formation of an insulative supercontinent changed the thermal pattern of the crust-mantle region. The change in upper-mantle thermal convection led to the br ...
... caused development of orogens, melting anomalies and other thermal events under a compressional tectonic regime along continental margins. The formation of an insulative supercontinent changed the thermal pattern of the crust-mantle region. The change in upper-mantle thermal convection led to the br ...
inner core - Denton ISD
... different layers. The crust is the layer that you live on, and it is the most widely studied and understood. The mantle is much hotter and has the ability to flow. The outer core and inner core are even hotter with pressures so great you would be squeezed into a ball smaller than a marble if you wer ...
... different layers. The crust is the layer that you live on, and it is the most widely studied and understood. The mantle is much hotter and has the ability to flow. The outer core and inner core are even hotter with pressures so great you would be squeezed into a ball smaller than a marble if you wer ...
Earth is composed of 3 layers
... -about 1,800 mi. below the surface of earth -temperatures can reach 8,000*F ...
... -about 1,800 mi. below the surface of earth -temperatures can reach 8,000*F ...
Solid Earth
... Most scientists believe that convection within Earth’s lower and upper Mantle is the major driving force linked to plate motion. Convection is driven my temperature differences/density differences and gravity. ...
... Most scientists believe that convection within Earth’s lower and upper Mantle is the major driving force linked to plate motion. Convection is driven my temperature differences/density differences and gravity. ...
Chapter 02 Earth Structure and Plate Tectonics
... 7. Oceanic-type crust is more dense than continental-type crust. 8. The continental landmasses are less dense than the mantle and are buoyed up by depressing the underlying mantle. 9. The midocean ridges and rises are spreading centers where new oceanic crust is created. 10. The thickness of deep-se ...
... 7. Oceanic-type crust is more dense than continental-type crust. 8. The continental landmasses are less dense than the mantle and are buoyed up by depressing the underlying mantle. 9. The midocean ridges and rises are spreading centers where new oceanic crust is created. 10. The thickness of deep-se ...
Mantle plume
A mantle plume is a mechanism proposed in 1971 to explain volcanic regions of the earth that were not thought to be explicable by the then-new theory of plate tectonics. Some such volcanic regions lie far from tectonic plate boundaries, for example, Hawaii. Others represent unusually large-volume volcanism, whether on plate boundaries, e.g. Iceland, or basalt floods such as the Deccan or Siberian traps.A mantle plume is posited to exist where hot rock nucleates at the core-mantle boundary and rises through the Earth's mantle becoming a diapir in the Earth's crust. The currently active volcanic centers are known as ""hot spots"". In particular, the concept that mantle plumes are fixed relative to one another, and anchored at the core-mantle boundary, was thought to provide a natural explanation for the time-progressive chains of older volcanoes seen extending out from some such hot spots, such as the Hawaiian–Emperor seamount chain.The hypothesis of mantle plumes from depth is not universally accepted as explaining all such volcanism. It has required progressive hypothesis-elaboration leading to variant propositions such as mini-plumes and pulsing plumes. Another hypothesis for unusual volcanic regions is the ""Plate model"". This proposes shallower, passive leakage of magma from the mantle onto the Earth's surface where extension of the lithosphere permits it, attributing most volcanism to plate tectonic processes, with volcanoes far from plate boundaries resulting from intraplate extension.