Reading
... carrying continental crust, subduction occurs. Ocean crust, which is denser than continental crust, sinks beneath the continental crust forming a deep ocean trench. As the trench is formed, the oceanic crust is forced back into the mantle. As the rock material in the ocean crust begins to melt in th ...
... carrying continental crust, subduction occurs. Ocean crust, which is denser than continental crust, sinks beneath the continental crust forming a deep ocean trench. As the trench is formed, the oceanic crust is forced back into the mantle. As the rock material in the ocean crust begins to melt in th ...
Plate Tectonics - Illinois Wesleyan University
... • Oceanic lithosphere can be subducted. The oceanic crust is richer in Fe than the mantle and, when cold, is denser than mantle material, so it can sink. Presently, it does so by subducting as a big, coherent sheet that bends down and sinks into the mantle. Oceanic plate bends down at the trench. Se ...
... • Oceanic lithosphere can be subducted. The oceanic crust is richer in Fe than the mantle and, when cold, is denser than mantle material, so it can sink. Presently, it does so by subducting as a big, coherent sheet that bends down and sinks into the mantle. Oceanic plate bends down at the trench. Se ...
Lecture3_ptectonics2
... Large earthquakes Volcanoes over the subducting slab on the overriding plate ...
... Large earthquakes Volcanoes over the subducting slab on the overriding plate ...
BACKGROUNDINFORMATION
... famous San Andreas Fault zone in California, where the Pacific Plate and the North American Plate grind past each other at a rate of about five centimeters per year. This fault is approximately 1,300Km long and more than 10Km wide in several places, passing through approximately two-thirds of the st ...
... famous San Andreas Fault zone in California, where the Pacific Plate and the North American Plate grind past each other at a rate of about five centimeters per year. This fault is approximately 1,300Km long and more than 10Km wide in several places, passing through approximately two-thirds of the st ...
Year 9: Volcanoes and Earthquakes
... A continental plate and an oceanic plate move towards each other. The oceanic plate goes (subducts) under the continental plate as the oceanic plate is heavier. The friction causes earthquakes. The friction also creates heat which melts the oceanic crust, creating magma which will build up and creat ...
... A continental plate and an oceanic plate move towards each other. The oceanic plate goes (subducts) under the continental plate as the oceanic plate is heavier. The friction causes earthquakes. The friction also creates heat which melts the oceanic crust, creating magma which will build up and creat ...
Unit VI: Solid Earth Circulation
... 4.) Why are earthquakes focused along plate margins? Earthquakes are the result of plate motion: The plates move relative to each other at average speeds of a few centimeters per year. As a result of friction between the plates, there are alternating periods of stasis (during which stresses build) a ...
... 4.) Why are earthquakes focused along plate margins? Earthquakes are the result of plate motion: The plates move relative to each other at average speeds of a few centimeters per year. As a result of friction between the plates, there are alternating periods of stasis (during which stresses build) a ...
Assessing the nature of crust in the central Red Sea using potential
... The Red Sea is considered an important example of a rifted continental shield proceeding to a seafloor spreading stage of development, and the transition of crustal types there from stretched continental to oceanic should mark the onset of significant mantle melting. However, whether the crust in th ...
... The Red Sea is considered an important example of a rifted continental shield proceeding to a seafloor spreading stage of development, and the transition of crustal types there from stretched continental to oceanic should mark the onset of significant mantle melting. However, whether the crust in th ...
List and describe the 3 types of stress
... subduction stress pulls the Ocean to rocks apart. continental=subduction Continental to continental = mountain building The rocks move past each other. The shear Divergent: Mid stress pushes the rocks ocean ridges and horizontally rift valleys Convergent: subduction, volcanoes, ...
... subduction stress pulls the Ocean to rocks apart. continental=subduction Continental to continental = mountain building The rocks move past each other. The shear Divergent: Mid stress pushes the rocks ocean ridges and horizontally rift valleys Convergent: subduction, volcanoes, ...
Day 7 Presentation - Earthquakes and Plate Tectonics
... – As plates move apart new material is erupted to fill the gap ...
... – As plates move apart new material is erupted to fill the gap ...
Dynamic Crust
... (ii) Indian plate colliding with the Eurasian plate; forming the __________________________________ mtns. (d) _____________________________ - _____________________________ - Slab Pull ...
... (ii) Indian plate colliding with the Eurasian plate; forming the __________________________________ mtns. (d) _____________________________ - _____________________________ - Slab Pull ...
Answer Key for Effects of Plate Tectonics Note-taking
... beneath the lighter continental plate, into the asthenosphere. This region is called a subduction zone and the tectonic forces are so strong that a trench or crack can form in the ocean floor. ...
... beneath the lighter continental plate, into the asthenosphere. This region is called a subduction zone and the tectonic forces are so strong that a trench or crack can form in the ocean floor. ...
Plate Tectonics - University of Colorado Boulder
... • The geometric fit of the continents. • The similarity in rock age groups ...
... • The geometric fit of the continents. • The similarity in rock age groups ...
- Catalyst
... Seismic waves are generated naturally by earthquakes and anthropogencally by detonation of nuclear bombs or other explosives below the ground surface. ...
... Seismic waves are generated naturally by earthquakes and anthropogencally by detonation of nuclear bombs or other explosives below the ground surface. ...
chpt 17 continental drift
... Earthquakes travel through the Earth in wave form. These are called body waves and there are two kinds: a. Primary waves (P-waves) are waves that travel parallel to the direction of the wave. They are a ‘compression’ wave. They are like pulling on a spring and letting the end go. It stretches and ...
... Earthquakes travel through the Earth in wave form. These are called body waves and there are two kinds: a. Primary waves (P-waves) are waves that travel parallel to the direction of the wave. They are a ‘compression’ wave. They are like pulling on a spring and letting the end go. It stretches and ...
Chapter 3
... Continental Drift and Plate Tectonics • Jigsaw-puzzle fit of continents observed a few centuries ago • Mechanism to describe how continental masses moved was not easily visualized for decades • Later half of 20th century the concept of continental drift was incorporated into a broader concept of Pl ...
... Continental Drift and Plate Tectonics • Jigsaw-puzzle fit of continents observed a few centuries ago • Mechanism to describe how continental masses moved was not easily visualized for decades • Later half of 20th century the concept of continental drift was incorporated into a broader concept of Pl ...
Plate tectonics
... • When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer rocks rise while the cooler rocks sink, creating slow, vertical currents within the mantle (these convection currents move mantle rocks only a few centimeters a year). T ...
... • When mantle rocks near the radioactive core are heated, they become less dense than the cooler, upper mantle rocks. These warmer rocks rise while the cooler rocks sink, creating slow, vertical currents within the mantle (these convection currents move mantle rocks only a few centimeters a year). T ...
Lab 2 Presentation slides
... rigid lithosphere, which are "floating" in isostatic equilibrium on a plastic region of earth's mantle called the asthenosphere. *Note that bottom figure is schematic and mantle lithosphere is much thicker than typical continental & oceanic crust. ...
... rigid lithosphere, which are "floating" in isostatic equilibrium on a plastic region of earth's mantle called the asthenosphere. *Note that bottom figure is schematic and mantle lithosphere is much thicker than typical continental & oceanic crust. ...
Earth Science
... tropical plants found – island was close to the equator about 300 million years ago, then moved ...
... tropical plants found – island was close to the equator about 300 million years ago, then moved ...
The Earth`s Interior
... Convergent Boundaries Ex: Andes Mountains in S. America (Still growing because of subduction) 3. ★Common place to find volcanoes Ex: Cascade Range (Mt. St. Helens & Mt. Rainier) ...
... Convergent Boundaries Ex: Andes Mountains in S. America (Still growing because of subduction) 3. ★Common place to find volcanoes Ex: Cascade Range (Mt. St. Helens & Mt. Rainier) ...
3.3 Plates Move Apart
... two continental plates converge An oceanic plate converges with another plate One plate scrapes past another. ...
... two continental plates converge An oceanic plate converges with another plate One plate scrapes past another. ...
Earth Science Chapter 20: Mountain Building Chapter Overview
... As peaks are eroded, mass decreases, and the roots of the mountains become smaller. A balance between erosion and the decrease on the size of the root will continue for hundreds of millions of years until both the mountains and their roots disappear. This slow process of the crust’s rising as the re ...
... As peaks are eroded, mass decreases, and the roots of the mountains become smaller. A balance between erosion and the decrease on the size of the root will continue for hundreds of millions of years until both the mountains and their roots disappear. This slow process of the crust’s rising as the re ...
PLATE TECHTONICS
... forces that are available to drive the plates include the following: ridge push, trench pull, slab pull, viscous drag at the base of the plate, and the Eötvös force. The graph above indicates that the fastest plates on Earth, like the Juan de Fuca, Pacific, Philippines, and Cocos Plates, are oceanic ...
... forces that are available to drive the plates include the following: ridge push, trench pull, slab pull, viscous drag at the base of the plate, and the Eötvös force. The graph above indicates that the fastest plates on Earth, like the Juan de Fuca, Pacific, Philippines, and Cocos Plates, are oceanic ...
Powerpoint Presentation Physical Geology, 10/e
... more dense with distance from mid-oceanic ridge • When sufficiently cool and dense, these rocks may sink back into the mantle at subduction zones – Downward plunge of cold rocks gives rise to oceanic trenches ...
... more dense with distance from mid-oceanic ridge • When sufficiently cool and dense, these rocks may sink back into the mantle at subduction zones – Downward plunge of cold rocks gives rise to oceanic trenches ...
Oceanic trench
The oceanic trenches are hemispheric-scale long but narrow topographic depressions of the sea floor. They are also the deepest parts of the ocean floor. Oceanic trenches are a distinctive morphological feature of convergent plate boundaries, along which lithospheric plates move towards each other at rates that vary from a few mm to over ten cm per year. A trench marks the position at which the flexed, subducting slab begins to descend beneath another lithospheric slab. Trenches are generally parallel to a volcanic island arc, and about 200 km (120 mi) from a volcanic arc. Oceanic trenches typically extend 3 to 4 km (1.9 to 2.5 mi) below the level of the surrounding oceanic floor. The greatest ocean depth to be sounded is in the Challenger Deep of the Mariana Trench, at a depth of 11,034 m (36,201 ft) below sea level. Oceanic lithosphere moves into trenches at a global rate of about 3 km2/yr.