Lecture 13.
... the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and density. One interesting property of the continental and oceanic crust is that these tectonic plates have the ability to ...
... the state of gravitational equilibrium between the earth's lithosphere and asthenosphere such that the tectonic plates "float" at an elevation which depends on their thickness and density. One interesting property of the continental and oceanic crust is that these tectonic plates have the ability to ...
Subduction history of the Farallon plate under North America
... •Computational seismology works on improving imaging methods. Other geoscientists care mainly about the images themselves. •Hopefully, tomography results make sense in light of surface studies (geology, tectonics) and mantle convection simulations (geodynamics). •Solutions are non-unique -- but how ...
... •Computational seismology works on improving imaging methods. Other geoscientists care mainly about the images themselves. •Hopefully, tomography results make sense in light of surface studies (geology, tectonics) and mantle convection simulations (geodynamics). •Solutions are non-unique -- but how ...
Oceanic Lithosphere
... surface are caused by normal faults in the subducting oceanic lithosphere. As the plate is subducted, it is forced to bend, so the upper part is put under tension, this causes the normal faulting. Another reason why shallow earthquakes occur is due to the process of “underthrusting”, where the subdu ...
... surface are caused by normal faults in the subducting oceanic lithosphere. As the plate is subducted, it is forced to bend, so the upper part is put under tension, this causes the normal faulting. Another reason why shallow earthquakes occur is due to the process of “underthrusting”, where the subdu ...
5A_Plate Tectonics Lecture
... When two oceanic plates converge, one descends beneath the other initiating volcanic activity (similar to the oceanic - continental case), but the volcanoes form on the ocean floor rather than on continents. ...
... When two oceanic plates converge, one descends beneath the other initiating volcanic activity (similar to the oceanic - continental case), but the volcanoes form on the ocean floor rather than on continents. ...
SCI Ch2 Study Guide KEY
... can be caused by water, wind, ice, and gravity. An example of erosion is rivers and streams carrying rock fragments as the water flows downhill. 3. How are U-shaped valleys formed? ...
... can be caused by water, wind, ice, and gravity. An example of erosion is rivers and streams carrying rock fragments as the water flows downhill. 3. How are U-shaped valleys formed? ...
Page 1
... Divergent Boundary 8. A plate boundary where two oceanic plates move apart (or diverge) creating sea-floor spreading that allows lava or magma up through the cracks. OR when two continental plates move apart (or diverge) creating rift valleys Transform Boundary 9. A plate boundary where two plates s ...
... Divergent Boundary 8. A plate boundary where two oceanic plates move apart (or diverge) creating sea-floor spreading that allows lava or magma up through the cracks. OR when two continental plates move apart (or diverge) creating rift valleys Transform Boundary 9. A plate boundary where two plates s ...
Lesson 4 - davis.k12.ut.us
... Mantle Create a diagram to illustrate convection currents in the mantle. Use Convection Figure 21 to help you. Use with pages 486–488. ...
... Mantle Create a diagram to illustrate convection currents in the mantle. Use Convection Figure 21 to help you. Use with pages 486–488. ...
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 3 Vocabulary
... geosphere the mostly solid, rocky part of the Earth; extends from the center of the core to the surface of the crust greenhouse effect the warming of the surface and lower atmosphere of Earth that occurs when carbon dioxide, water vapor, and other gases in the air absorb and ...
... geosphere the mostly solid, rocky part of the Earth; extends from the center of the core to the surface of the crust greenhouse effect the warming of the surface and lower atmosphere of Earth that occurs when carbon dioxide, water vapor, and other gases in the air absorb and ...
Plate Tectonics Introduction Boundaries between crustal plates
... drifted great distances (not to mention the fact that Wegener was a meteorologist) his ideas were widely rejected. In the subsequently developed hypotheses of seafloor spreading and plate tectonics, however, there was no problem of continents plowing through oceanic rock. Instead, rigid plates, incl ...
... drifted great distances (not to mention the fact that Wegener was a meteorologist) his ideas were widely rejected. In the subsequently developed hypotheses of seafloor spreading and plate tectonics, however, there was no problem of continents plowing through oceanic rock. Instead, rigid plates, incl ...
EARTH-2
... he crust covers the mantle and is the earth's hard outer shell, the surface on which we are living. Compared to the other layers the crust is much thinner. It floats upon the softer, denser mantle. The crust is made up of solid material but this material is not the same everywhere. There is an Ocea ...
... he crust covers the mantle and is the earth's hard outer shell, the surface on which we are living. Compared to the other layers the crust is much thinner. It floats upon the softer, denser mantle. The crust is made up of solid material but this material is not the same everywhere. There is an Ocea ...
Volcanoes_and_Plate_Tectonics
... Since the upper parts of the earth are solid, special conditions are necessary to form magma. Volcanism occurs in four principal settings: 1. Along divergent plate boundaries, such as Oceanic Ridges or spreading centers. 2. In areas of continental extension(they may become divergent plate boundaries ...
... Since the upper parts of the earth are solid, special conditions are necessary to form magma. Volcanism occurs in four principal settings: 1. Along divergent plate boundaries, such as Oceanic Ridges or spreading centers. 2. In areas of continental extension(they may become divergent plate boundaries ...
28.1 Understanding Earth
... each other. One result of two plates converging is subduction. A deep oceanic trench marks the boundary between a subducting and an overriding plate at a convergent boundary. ...
... each other. One result of two plates converging is subduction. A deep oceanic trench marks the boundary between a subducting and an overriding plate at a convergent boundary. ...
what causes earthquakes what is a fault? (traduzione del
... centrifugal force towards the equator. He believed that Pangaea originated near the south pole and that the centrifugal force of the planet caused the protocontinent to break apart and the resultant continents to drift towards the equator. He called this the "polefleeing force". This idea was quickl ...
... centrifugal force towards the equator. He believed that Pangaea originated near the south pole and that the centrifugal force of the planet caused the protocontinent to break apart and the resultant continents to drift towards the equator. He called this the "polefleeing force". This idea was quickl ...
Istanbul Himalayas Tokyo San Andreas Fault Thingvellir East
... effects. The San Andreas fault has been responsible for many tremors and quakes, with the most notable (so far) being in 1906, which destroyed much of San Francisco. The City has been rebuilt, and modern construction technology has reduced the potential for loss of life and buildings. Tokyo has a hu ...
... effects. The San Andreas fault has been responsible for many tremors and quakes, with the most notable (so far) being in 1906, which destroyed much of San Francisco. The City has been rebuilt, and modern construction technology has reduced the potential for loss of life and buildings. Tokyo has a hu ...
Paper 1 restless earth
... These convection currents drag the tectonic plates causing them to move along the surface. This movement is called plate tectonics. ...
... These convection currents drag the tectonic plates causing them to move along the surface. This movement is called plate tectonics. ...
here
... volcanoes(38). The point where two plates meet is called a plate boundary(39). Earthquakes and volcanoes are most likely to occur either on or near plate boundaries(40). There are three types of boundaries that we can observe. These plate boundaries are: Divergent boundary The word divergent is a bi ...
... volcanoes(38). The point where two plates meet is called a plate boundary(39). Earthquakes and volcanoes are most likely to occur either on or near plate boundaries(40). There are three types of boundaries that we can observe. These plate boundaries are: Divergent boundary The word divergent is a bi ...
Layers of Earth Comparisons
... Earth’s layers are compared by: • Temperature • Density – (the thickness or depth of the layer) ...
... Earth’s layers are compared by: • Temperature • Density – (the thickness or depth of the layer) ...
Ch 3 ppt
... There are 7 types of plate boundaries Divergent (2 types) 1. Continental: extensional forces move continental crust apart. Faulting, stretching, and thinning of crust occurs. Magma may intrude. 2. Oceanic: spreading ridges, occur beneath the ocean Faulting and thinning of crust occurs. Lava flows o ...
... There are 7 types of plate boundaries Divergent (2 types) 1. Continental: extensional forces move continental crust apart. Faulting, stretching, and thinning of crust occurs. Magma may intrude. 2. Oceanic: spreading ridges, occur beneath the ocean Faulting and thinning of crust occurs. Lava flows o ...
As the continental shelf gets steeper the water depth
... The mid-oceanic ridge is like an underwater mountain range. The mountains can reach a height of up to 3000m and the can be around 2000m wide. There are deep trenched that are located in the center of the mid-oceanic ridge; it divides the mountain ranges right down the center. These trenches reach de ...
... The mid-oceanic ridge is like an underwater mountain range. The mountains can reach a height of up to 3000m and the can be around 2000m wide. There are deep trenched that are located in the center of the mid-oceanic ridge; it divides the mountain ranges right down the center. These trenches reach de ...
Plate tectonics
Plate tectonics (from the Late Latin tectonicus, from the Greek: τεκτονικός ""pertaining to building"") is a scientific theory that describes the large-scale motion of Earth's lithosphere. This theoretical model builds on the concept of continental drift which was developed during the first few decades of the 20th century. The geoscientific community accepted the theory after the concepts of seafloor spreading were later developed in the late 1950s and early 1960s.The lithosphere, which is the rigid outermost shell of a planet (on Earth, the crust and upper mantle), is broken up into tectonic plates. On Earth, there are seven or eight major plates (depending on how they are defined) and many minor plates. Where plates meet, their relative motion determines the type of boundary; convergent, divergent, or transform. Earthquakes, volcanic activity, mountain-building, and oceanic trench formation occur along these plate boundaries. The lateral relative movement of the plates typically varies from zero to 100 mm annually.Tectonic plates are composed of oceanic lithosphere and thicker continental lithosphere, each topped by its own kind of crust. Along convergent boundaries, subduction carries plates into the mantle; the material lost is roughly balanced by the formation of new (oceanic) crust along divergent margins by seafloor spreading. In this way, the total surface of the globe remains the same. This prediction of plate tectonics is also referred to as the conveyor belt principle. Earlier theories (that still have some supporters) propose gradual shrinking (contraction) or gradual expansion of the globe.Tectonic plates are able to move because the Earth's lithosphere has greater strength than the underlying asthenosphere. Lateral density variations in the mantle result in convection. Plate movement is thought to be driven by a combination of the motion of the seafloor away from the spreading ridge (due to variations in topography and density of the crust, which result in differences in gravitational forces) and drag, with downward suction, at the subduction zones. Another explanation lies in the different forces generated by the rotation of the globe and the tidal forces of the Sun and Moon. The relative importance of each of these factors and their relationship to each other is unclear, and still the subject of much debate.