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SGES 1302 Lecture6 - Department Of Geology
... It is accepted that the excess density of the oceanic lithosphere sinking in subduction zones drives plate motions. When it forms at mid-ocean ridges, the oceanic lithosphere is initially less dense than the underlying asthenosphere, but it becomes more dense with age, as it conductively cools and t ...
... It is accepted that the excess density of the oceanic lithosphere sinking in subduction zones drives plate motions. When it forms at mid-ocean ridges, the oceanic lithosphere is initially less dense than the underlying asthenosphere, but it becomes more dense with age, as it conductively cools and t ...
Plate Tectonics
... ◦ As plates move, new volcanoes are formed along the floor bottom above the hot spot ◦ Hawaii – age of features increase as you move away from the hot spot (Kilauea) ◦ Therefore: The plates are moving over the hot spot and forming new volcanic features. ...
... ◦ As plates move, new volcanoes are formed along the floor bottom above the hot spot ◦ Hawaii – age of features increase as you move away from the hot spot (Kilauea) ◦ Therefore: The plates are moving over the hot spot and forming new volcanic features. ...
Plate Tectonics Intro- Theory and History
... The Earth’s crust is broken into about 12 rigid plates, which slide over a semi-molten plastic layer of the mantle. ...
... The Earth’s crust is broken into about 12 rigid plates, which slide over a semi-molten plastic layer of the mantle. ...
(composed of the continental crust and oceanic crust).
... Geologists use the term lithosphere to mean an outer Earth zone, or shell, of rigid, brittle rock. It includes not only the crust, but also the cooler, upper part of the mantle that is composed of brittle rock. The rigid, brittle lithosphere rests on top of a soft, plastic underlayer named the asthe ...
... Geologists use the term lithosphere to mean an outer Earth zone, or shell, of rigid, brittle rock. It includes not only the crust, but also the cooler, upper part of the mantle that is composed of brittle rock. The rigid, brittle lithosphere rests on top of a soft, plastic underlayer named the asthe ...
ppt: Plate Tectonics Intro- Theory and History
... The Earth’s crust is broken into about 12 rigid plates, which slide over a semi-molten plastic layer of the mantle. ...
... The Earth’s crust is broken into about 12 rigid plates, which slide over a semi-molten plastic layer of the mantle. ...
The Theory of Plate Tectonics
... convection currents rise in the asthenosphere and spread out beneath the lithosphere ...
... convection currents rise in the asthenosphere and spread out beneath the lithosphere ...
Plate Tectonics - Down To Earth Science
... Activity depends upon the types of crust that meet; If a more dense oceanic plate slides under a less dense continental plate or another oceanic plate, there is a subduction zone, and some crust is destroyed If two continental plates converge, both plates buckle and push up into mountain range ...
... Activity depends upon the types of crust that meet; If a more dense oceanic plate slides under a less dense continental plate or another oceanic plate, there is a subduction zone, and some crust is destroyed If two continental plates converge, both plates buckle and push up into mountain range ...
Continental drift and plate tectonics
... the sea floor spreads apart along both sides of a midocean ridge as new crust is added to the ocean floor. As a result, the ocean floors move like conveyor belts, carrying the continents along with them. ...
... the sea floor spreads apart along both sides of a midocean ridge as new crust is added to the ocean floor. As a result, the ocean floors move like conveyor belts, carrying the continents along with them. ...
Place on the Earth where seismic waves are first felt
... A body wave that can only travel through solids; slowest body wave. Two plates that are sliding past one another. ...
... A body wave that can only travel through solids; slowest body wave. Two plates that are sliding past one another. ...
Interior Earth vocabulary.xlsx
... apart about 200 million years ago. A deep valley formed as tectonic plates move apart, such as along a mid-ocean ridge. ...
... apart about 200 million years ago. A deep valley formed as tectonic plates move apart, such as along a mid-ocean ridge. ...
Plate Tectonics Notes
... - The “excess energy” may explain why trench areas violate isostasy—higher than they should be - Depth of oceans (shallowest at ridges) is consistent with sea-floor spreading…as the rock cools, it contracts, making the oceans deeper - Also consistent with oldest rocks in trenches, youngest at ocean ...
... - The “excess energy” may explain why trench areas violate isostasy—higher than they should be - Depth of oceans (shallowest at ridges) is consistent with sea-floor spreading…as the rock cools, it contracts, making the oceans deeper - Also consistent with oldest rocks in trenches, youngest at ocean ...
This test review is in preparation for a chemistry test
... 12) The puzzle-like fit of the continents is one of the evidences given to explain continental drift (yes, this should be one of your answers for #6!), but the continents don’t fit together perfectly. Why? ...
... 12) The puzzle-like fit of the continents is one of the evidences given to explain continental drift (yes, this should be one of your answers for #6!), but the continents don’t fit together perfectly. Why? ...
Earth's Structure - Kentucky Department of Education
... divided into tectonic plates that are in constant, slow motion, driven by convection currents in the mantle. ...
... divided into tectonic plates that are in constant, slow motion, driven by convection currents in the mantle. ...
Plate Tectonics: Ch. 22.4 Self Quiz
... that Alfred Wegner used to support his theory of Continental Drift? a. Fossil records from continents separated by oceans b. Similar geological formations, like mountain chains, on different continents. c. Observations of sea floor spreading at the MidOcean Ridge. d. Evidence of glaciers in location ...
... that Alfred Wegner used to support his theory of Continental Drift? a. Fossil records from continents separated by oceans b. Similar geological formations, like mountain chains, on different continents. c. Observations of sea floor spreading at the MidOcean Ridge. d. Evidence of glaciers in location ...
Plate Tectonics: Ch. 22.4 Self Quiz
... that Alfred Wegner used to support his theory of Continental Drift? a. Fossil records from continents separated by oceans b. Similar geological formations, like mountain chains, on different continents. c. Observations of sea floor spreading at the MidOcean Ridge. d. Evidence of glaciers in location ...
... that Alfred Wegner used to support his theory of Continental Drift? a. Fossil records from continents separated by oceans b. Similar geological formations, like mountain chains, on different continents. c. Observations of sea floor spreading at the MidOcean Ridge. d. Evidence of glaciers in location ...
Geology 101, Fall 2006 continental drift vs. plate tectonics
... active contintental margin vs. passive continental margin ...
... active contintental margin vs. passive continental margin ...
Poetry Test Study Guide
... Dear Parents & Students, Your signature below indicates that you are aware that there will be a test in Science on Friday, December 16, 2011. Parents, please quiz your child at home using this study guide and additional ...
... Dear Parents & Students, Your signature below indicates that you are aware that there will be a test in Science on Friday, December 16, 2011. Parents, please quiz your child at home using this study guide and additional ...
Plate Tectonics - bvsd.k12.pa.us
... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
1 - Ridgefield School District
... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
... 3. The crust and upper mantle together are called the ____________________. 4. Beneath this layer is the plasticlike ____________________. 5. Scientists suggest that differences in density cause hot, plasticlike rock to be forced upward toward the surface, cool, and sink. This cycle is called a ____ ...
Sample_reading_tasks
... seven large and several smaller plates. The plates, which are rigid, float on the underlying semimolten mantle (the asthenosphere) and are (2) by convection currents. There are two types of plate: continental and oceanic. However, these terms do not refer to actual continents and oceans but to diffe ...
... seven large and several smaller plates. The plates, which are rigid, float on the underlying semimolten mantle (the asthenosphere) and are (2) by convection currents. There are two types of plate: continental and oceanic. However, these terms do not refer to actual continents and oceans but to diffe ...
Plate Tectonics Notes
... The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed. This crust is not a _________________ it is broken up into huge, thick plates that drift atop the soft (plastic!), underlying mantle. The Crust ...
... The Earth's rocky outer crust solidified billions of years ago, soon after the Earth formed. This crust is not a _________________ it is broken up into huge, thick plates that drift atop the soft (plastic!), underlying mantle. The Crust ...
Chapter 10 Test Review
... into plates made up of both continental and oceanic crust. A collision at a convergent boundary formed the _____________ ________________. During ____________________ a terrane becomes part of a continent. The San Andreas Fault in California is and example of a _____________ ___________. __________ ...
... into plates made up of both continental and oceanic crust. A collision at a convergent boundary formed the _____________ ________________. During ____________________ a terrane becomes part of a continent. The San Andreas Fault in California is and example of a _____________ ___________. __________ ...
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.