plate tectonics
... • The upper mantle and crust (lithosphere) lie on the lower mantle which is fluid. The rocks in the lower mantle (asthenosphere) move in a fluid manner because of the high temperatures and pressures in it. • Currents in the lower mantle form convection cells which cause the plates to float. Types of ...
... • The upper mantle and crust (lithosphere) lie on the lower mantle which is fluid. The rocks in the lower mantle (asthenosphere) move in a fluid manner because of the high temperatures and pressures in it. • Currents in the lower mantle form convection cells which cause the plates to float. Types of ...
Poor Wegener - Issaquah Connect
... with sonar. They mapped out the shape of the ocean floor and found a big surprise. This surprise and other evidence was the basis for the Theory of Seafloor Spreading proposed by Hess in 1960. The Theory of Seafloor Spreading gave a great deal of credibility to Wegener’s Theory of Continental Drift. ...
... with sonar. They mapped out the shape of the ocean floor and found a big surprise. This surprise and other evidence was the basis for the Theory of Seafloor Spreading proposed by Hess in 1960. The Theory of Seafloor Spreading gave a great deal of credibility to Wegener’s Theory of Continental Drift. ...
a model of sea-floor spreading
... features: flat plains, long mountain chains, and deep trenches. Mid-ocean ridges are part of chain of mountains some 84,000 km long. The Mid-Atlantic Ridge is the longest mountain chain on Earth. These ridges are spreading centers or divergent plate boundaries where the upwelling of magma from the m ...
... features: flat plains, long mountain chains, and deep trenches. Mid-ocean ridges are part of chain of mountains some 84,000 km long. The Mid-Atlantic Ridge is the longest mountain chain on Earth. These ridges are spreading centers or divergent plate boundaries where the upwelling of magma from the m ...
Q: What theory explains why the continents move? Q: What causes
... Q: What is it called when Earth’s magnetic poles change places (north to south and south to north)? ...
... Q: What is it called when Earth’s magnetic poles change places (north to south and south to north)? ...
Plate Project SCRIPT
... new oceanic crust is formed in the gap between two diverging plates. Plate area is increased as the plates move apart. 2. Plate movement takes place laterally away from the plate boundary, which is normally marked by a rise or a ridge. The ridge or rise may be offset by a transform fault. 3. Present ...
... new oceanic crust is formed in the gap between two diverging plates. Plate area is increased as the plates move apart. 2. Plate movement takes place laterally away from the plate boundary, which is normally marked by a rise or a ridge. The ridge or rise may be offset by a transform fault. 3. Present ...
File
... c) Color of the sand in N. America b) Fossils found in S. America and Africa d) Gravitational pull of the moon 3. Although Wegener presented an interesting theory of continental drift. What was the one part of his continental drift theory that he could not convince others was ...
... c) Color of the sand in N. America b) Fossils found in S. America and Africa d) Gravitational pull of the moon 3. Although Wegener presented an interesting theory of continental drift. What was the one part of his continental drift theory that he could not convince others was ...
File
... Assessment is not a vocabulary test, being familiar with these terms, all of which are found in your notes and can be found on my website (rossbrownscience.com) will certainly help you answer the questions. Please use this sheet; it is yours. Jot down notes or draw pictures so you’re sure you are fa ...
... Assessment is not a vocabulary test, being familiar with these terms, all of which are found in your notes and can be found on my website (rossbrownscience.com) will certainly help you answer the questions. Please use this sheet; it is yours. Jot down notes or draw pictures so you’re sure you are fa ...
SGES 1302 Lecture4
... Although solid, the asthenosphere has relatively low viscosity and shear strength and can flow on geological time scales. The deeper mantle below the asthenosphere is more rigid again. The lithosphere is broken up into what are called tectonic plates—in the case of Earth, there are seven major and m ...
... Although solid, the asthenosphere has relatively low viscosity and shear strength and can flow on geological time scales. The deeper mantle below the asthenosphere is more rigid again. The lithosphere is broken up into what are called tectonic plates—in the case of Earth, there are seven major and m ...
1 Page Paper Essay Harry Hess
... went to college at Yale University. He flunked his first course and was told he had not future in the field. But he didn’t give up. Later on he began teaching geology at Princeton University. Then World War 1 was declared. He enlisted for the Naval Reserve and was only a junior in Collage. Yeah, he ...
... went to college at Yale University. He flunked his first course and was told he had not future in the field. But he didn’t give up. Later on he began teaching geology at Princeton University. Then World War 1 was declared. He enlisted for the Naval Reserve and was only a junior in Collage. Yeah, he ...
GEO Ch 5A
... ______, twigs, litter, and small ______. Small particles of soil/rock are also found=sediment=sedimentary rock over time. 1. What would the Earth’s surface be like today if erosion were the only force acting upon it? What is erosion? 2. What are the four layers that the Earth is composed of? (Explai ...
... ______, twigs, litter, and small ______. Small particles of soil/rock are also found=sediment=sedimentary rock over time. 1. What would the Earth’s surface be like today if erosion were the only force acting upon it? What is erosion? 2. What are the four layers that the Earth is composed of? (Explai ...
Jigsaw Review 2 - Earth Science with Mrs. Wilson
... 1. What were the 3 pieces of evidence that Alfred Wegener used for his theory of Continental Drift? ...
... 1. What were the 3 pieces of evidence that Alfred Wegener used for his theory of Continental Drift? ...
Earth`s Interior
... 4. Describe what happens when a. two plates carryingoceanic crust collide, b. two plates carryingcontinental crust collide,and c. a plate carrying oceanic crust collideswith a plate carryingcontinental crust. ...
... 4. Describe what happens when a. two plates carryingoceanic crust collide, b. two plates carryingcontinental crust collide,and c. a plate carrying oceanic crust collideswith a plate carryingcontinental crust. ...
Sequencing Rationale Curriculum Design
... The third and last subunit should be on the third type of boundary, the transform boundary. It should be taught last because it is the one that is the most different from the other two. Instead of the plates moving towards or away from each other and effecting the Earth’s surface the plates are slid ...
... The third and last subunit should be on the third type of boundary, the transform boundary. It should be taught last because it is the one that is the most different from the other two. Instead of the plates moving towards or away from each other and effecting the Earth’s surface the plates are slid ...
SUBDUCTION
... It follows that if continents collide, resulting in larger continental masses, smaller land-masses must also be colliding with continents. This map shows different terranes that have accreted to western continental ...
... It follows that if continents collide, resulting in larger continental masses, smaller land-masses must also be colliding with continents. This map shows different terranes that have accreted to western continental ...
plate tectonics
... insight to the mechanism for how the continents moved. • The magma which pushes up at the mid-ocean ridge provides the new land pushing the plates, and the subduction zones gobble up the land on the the other side of the plates. The mechanism was convection currents! ...
... insight to the mechanism for how the continents moved. • The magma which pushes up at the mid-ocean ridge provides the new land pushing the plates, and the subduction zones gobble up the land on the the other side of the plates. The mechanism was convection currents! ...
plate tectonics
... insight to the mechanism for how the continents moved. • The magma which pushes up at the mid-ocean ridge provides the new land pushing the plates, and the subduction zones gobble up the land on the the other side of the plates. The mechanism was convection currents! ...
... insight to the mechanism for how the continents moved. • The magma which pushes up at the mid-ocean ridge provides the new land pushing the plates, and the subduction zones gobble up the land on the the other side of the plates. The mechanism was convection currents! ...
here - GeoCoops
... fluids sweated out percolate upward, helping to locally melt the overlying solid mantle above the subducting plate to form pockets of liquid rock (magma). 13. The newly generated molten mantle (magma) is less dense than the surrounding rock, so it rises toward the surface. Most of the magma cools an ...
... fluids sweated out percolate upward, helping to locally melt the overlying solid mantle above the subducting plate to form pockets of liquid rock (magma). 13. The newly generated molten mantle (magma) is less dense than the surrounding rock, so it rises toward the surface. Most of the magma cools an ...
Layers of the Earth powerpoint
... Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. ...
... Basalt is much denser than the granite. Because of this the less dense continents ride on the denser oceanic plates. ...
File
... The Burgess Shale was discovered in 1909 and although it's high on a mountain now, at one time it was underwater on the continental edge of North America. The fossils embedded in the rock show a huge variety of species To protect from over-collection, the area became a World Heritage Site in 1981. ...
... The Burgess Shale was discovered in 1909 and although it's high on a mountain now, at one time it was underwater on the continental edge of North America. The fossils embedded in the rock show a huge variety of species To protect from over-collection, the area became a World Heritage Site in 1981. ...
Self-consistent generation of continental crust in global mantle
... ETH Zurich, Institute of Geophysics, Department of Earth Sciences, Zurich, Switzerland ([email protected]) ...
... ETH Zurich, Institute of Geophysics, Department of Earth Sciences, Zurich, Switzerland ([email protected]) ...
AIM: What evidence do we have for the Theory of
... • Rock Types and Structures - Rock evidence for continental exists in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean. • Ancient Climates ...
... • Rock Types and Structures - Rock evidence for continental exists in the form of several mountain belts that end at one coastline, only to reappear on a landmass across the ocean. • Ancient Climates ...
Plate Tectonics Plate tectonics
... New sea floor forms at divergent boundaries. The mid-ocean ridges are the most common type of divergent boundary. ...
... New sea floor forms at divergent boundaries. The mid-ocean ridges are the most common type of divergent boundary. ...
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.