Along this axis of the Aleutian Trench lies the subduction zone, in
... Fortunately, several years before Wegener died in Greenland, a Dutch geophysicist, Felix Vening Meinesz contrived to test the theory that very deep oceanic trenches represented mysterious forces at the edges or boundaries of continental plates. If there were unseen forces tugging or forcing sedimen ...
... Fortunately, several years before Wegener died in Greenland, a Dutch geophysicist, Felix Vening Meinesz contrived to test the theory that very deep oceanic trenches represented mysterious forces at the edges or boundaries of continental plates. If there were unseen forces tugging or forcing sedimen ...
Plate tectonics chapter 4 test bank
... 132. What was the major problem with Wegener's theory of continental drift? 133. Why is there stress on the Earth's crust? 134. Use the following terms to create a concept map: sea-floor spreading, convergent boundary, divergent boundary, subduction zone, transform boundary, tectonic plates. 135. Wh ...
... 132. What was the major problem with Wegener's theory of continental drift? 133. Why is there stress on the Earth's crust? 134. Use the following terms to create a concept map: sea-floor spreading, convergent boundary, divergent boundary, subduction zone, transform boundary, tectonic plates. 135. Wh ...
The Earth
... • Divided into seven to eight main plates and several smaller ones. • The plates move by convection currents that either push the plates apart, together or make them slide against one another. ...
... • Divided into seven to eight main plates and several smaller ones. • The plates move by convection currents that either push the plates apart, together or make them slide against one another. ...
Tectonic Plate Boundaries
... The sliding of one plate under another is called _______________. The part of the plate that goes under is called a ___________________________. __________________, deep depressions in the seafloor, are formed at subduction zones. As one plate subducts, the plates grind past one another. This create ...
... The sliding of one plate under another is called _______________. The part of the plate that goes under is called a ___________________________. __________________, deep depressions in the seafloor, are formed at subduction zones. As one plate subducts, the plates grind past one another. This create ...
The Earth
... • Divided into seven to eight main plates and several smaller ones. • The plates move by convection currents that either push the plates apart, together or make them slide against one another. ...
... • Divided into seven to eight main plates and several smaller ones. • The plates move by convection currents that either push the plates apart, together or make them slide against one another. ...
Dynamic Crust Part 2
... the epicenter increases To find the epicenter data from at least three different recording stations must be used Seismologists draw a circle around the station using a radius equal to the distance from the epicenter Where the three circle intersect is the epicenter ...
... the epicenter increases To find the epicenter data from at least three different recording stations must be used Seismologists draw a circle around the station using a radius equal to the distance from the epicenter Where the three circle intersect is the epicenter ...
Whole Mantle Dynamics
... The Rayleigh Number must be considered. The two modes of heat transport in planets are conduction and convection. Conduction (Fourier’s Law) gets heat to the surface through rigid rock. Convection tr ...
... The Rayleigh Number must be considered. The two modes of heat transport in planets are conduction and convection. Conduction (Fourier’s Law) gets heat to the surface through rigid rock. Convection tr ...
structure of Earth and the processes that have altered
... As the plates continued to move and split apart, oceans were formed, landmasses collided and split apart until the Earth’s landmasses came to be in the positions they are now; Evidence of these landmass collisions and splits comes from fossils, landform shape, features, and rock structures, and ...
... As the plates continued to move and split apart, oceans were formed, landmasses collided and split apart until the Earth’s landmasses came to be in the positions they are now; Evidence of these landmass collisions and splits comes from fossils, landform shape, features, and rock structures, and ...
Earthquakes, Volcanoes, and Plate Tectonics
... seismologists noted that seismic waves slowed when they reached the base of the lithosphere. WHY? ...
... seismologists noted that seismic waves slowed when they reached the base of the lithosphere. WHY? ...
049555507X_131304 - ASB
... Two models involving thermal convection cells have been proposed to explain plate movement. 1. thermal cells are restricted to the asthenosphere 2. the entire mantle is involved. ...
... Two models involving thermal convection cells have been proposed to explain plate movement. 1. thermal cells are restricted to the asthenosphere 2. the entire mantle is involved. ...
Earth`s Tectonic Plates - kmstorres
... and the African Plate are also pulling apart. The Mid-Atlantic Ridge has formed at these divergent boundaries. It is the longest mountain range in the world-and it's under water! ...
... and the African Plate are also pulling apart. The Mid-Atlantic Ridge has formed at these divergent boundaries. It is the longest mountain range in the world-and it's under water! ...
APES Focus/Ch - cynthiaahmed
... 12. Igneous rocks are those formed directly from magma. They are classified as basaltic or granitic, and by their mode of formation as extensive or intrusive. Explain each of these terms. ...
... 12. Igneous rocks are those formed directly from magma. They are classified as basaltic or granitic, and by their mode of formation as extensive or intrusive. Explain each of these terms. ...
Earth Structure - Processes in Structural Geology and Tectonics
... Continental crust has a mean composition that is less mafic than that of oceanic crust. Formation mode Continental crust is an amalgamation of rock that originally formed at volcanic arcs or hot spots, and then subsequently passes through the rock cycle. Mountain building, erosion and sedimentation, ...
... Continental crust has a mean composition that is less mafic than that of oceanic crust. Formation mode Continental crust is an amalgamation of rock that originally formed at volcanic arcs or hot spots, and then subsequently passes through the rock cycle. Mountain building, erosion and sedimentation, ...
Plate Tectonics Answers to Student Booklet.doc
... Figure 2 — Matching of Continental Edges Figure 3— Matching Rock Units on Different Continents Figure 4 — Fossils found in different parts of Gondwana ...
... Figure 2 — Matching of Continental Edges Figure 3— Matching Rock Units on Different Continents Figure 4 — Fossils found in different parts of Gondwana ...
Plate boundaries presentation
... Harry Hess discovered that magma was rising on the sea floor causing it to spread. The hot magma rising in the mantle caused the spreading on the sea floor and the large pieces of crust (tectonic plates) to move. Theory of Plate Tectonics These two theories lead to the Theory of Plate Tectonics. ...
... Harry Hess discovered that magma was rising on the sea floor causing it to spread. The hot magma rising in the mantle caused the spreading on the sea floor and the large pieces of crust (tectonic plates) to move. Theory of Plate Tectonics These two theories lead to the Theory of Plate Tectonics. ...
In Steps, you explored the theory of plate tectonics.
... Students will submit their Plate Tectonics Simulation. EVALUATION / GRADING: Student's simulations will be evaluated using a checklist /50. Variations on a Theme Running short on time? In the Steps section have students pair up. ...
... Students will submit their Plate Tectonics Simulation. EVALUATION / GRADING: Student's simulations will be evaluated using a checklist /50. Variations on a Theme Running short on time? In the Steps section have students pair up. ...
PLATE TECTONICS
... there exists a zone of subduction where old oceanic lithosphere is being consumed in order to maintain a constant volume of oceanic lithosphere. Zones of subduction for over the down-going portion of the asthenospheric convection cells and occur in two different scenarios. In the first, the oceanic ...
... there exists a zone of subduction where old oceanic lithosphere is being consumed in order to maintain a constant volume of oceanic lithosphere. Zones of subduction for over the down-going portion of the asthenospheric convection cells and occur in two different scenarios. In the first, the oceanic ...
Core
... each year) atop the less rigid mantle. The crust is thinner under the oceans (6-11 km thick); this is where new crust is formed. Continental crust is about 25-90 km thick. The lithosphere is defined as the crust and the upper mantle, a rigid layer about 100-200 km thick. The Mohorovicic discontinuit ...
... each year) atop the less rigid mantle. The crust is thinner under the oceans (6-11 km thick); this is where new crust is formed. Continental crust is about 25-90 km thick. The lithosphere is defined as the crust and the upper mantle, a rigid layer about 100-200 km thick. The Mohorovicic discontinuit ...
Evidence for Continental Drift
... move over a layer of partly molten rock B. the theory that the lithosphere is broken up into large plates that move and then rejoin C. an opening in Earth’s surface that, when active, spews out gases, chunks of rock, and melted rock D. an area where molten rock rises to Earth’s surface E. a pattern ...
... move over a layer of partly molten rock B. the theory that the lithosphere is broken up into large plates that move and then rejoin C. an opening in Earth’s surface that, when active, spews out gases, chunks of rock, and melted rock D. an area where molten rock rises to Earth’s surface E. a pattern ...
Chapter 9: Causes of Volcanic Eruptions
... • This is similar to what happens at a convergent boundary. A convergent boundary is a place where tectonic plates collide. • When an oceanic plate collides with a continental plate, the oceanic plate usually slides underneath the continental plate. • The process of subduction, the movement of one t ...
... • This is similar to what happens at a convergent boundary. A convergent boundary is a place where tectonic plates collide. • When an oceanic plate collides with a continental plate, the oceanic plate usually slides underneath the continental plate. • The process of subduction, the movement of one t ...
The Dynamic Planet Revealed - Frankfurt Institute for Advanced
... Ascending convection.-Ascending convection is associated with oceanic ridges (Hess 1962, Girdler 1965, Orowan 1965, 1966) . As mantle material rises beneath the ridge, it undergoes a nearly adiabatic pressure reduction and partial mel ting occurs. There is strong evidence that the upper mantle is o ...
... Ascending convection.-Ascending convection is associated with oceanic ridges (Hess 1962, Girdler 1965, Orowan 1965, 1966) . As mantle material rises beneath the ridge, it undergoes a nearly adiabatic pressure reduction and partial mel ting occurs. There is strong evidence that the upper mantle is o ...
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.