Plate Tectonics - Horizon Research, Inc.
... D. Plate motions are driven by a combination of Earth's heat and gravitational forces. The consensus among geologists is that “slab pull,” the sinking of oceanic plates at subduction zones (because that rock is old and relatively cold (dense)) is the primary driving force behind plate tectonics. Rid ...
... D. Plate motions are driven by a combination of Earth's heat and gravitational forces. The consensus among geologists is that “slab pull,” the sinking of oceanic plates at subduction zones (because that rock is old and relatively cold (dense)) is the primary driving force behind plate tectonics. Rid ...
Lesson Title: Tectonic Forces World Geography, Module 1, Lesson 6
... Geographers, geologists, and many other scientists study the movement of the plates and the changes they cause in order to understand how the earth is continually being reshaped. You will study various types of tectonic forces. (Helpful Hint: This movement of the plates is sometimes called the conti ...
... Geographers, geologists, and many other scientists study the movement of the plates and the changes they cause in order to understand how the earth is continually being reshaped. You will study various types of tectonic forces. (Helpful Hint: This movement of the plates is sometimes called the conti ...
The inside of the Earth Earth: Main ingredients Masses
... plate. It is cold, so it has high seismic velocity Pacific plate ...
... plate. It is cold, so it has high seismic velocity Pacific plate ...
Important Vocabulary Terms: Match them with definitions below
... 19. Where do you find magma and where do you find lava? Magma in the Earth, Lava outside the crust ...
... 19. Where do you find magma and where do you find lava? Magma in the Earth, Lava outside the crust ...
Seismic anisotropy measured at the scale of a continent: Australia
... the available data recorded within the framework of the many successive deployments have been processed and our new and far more extensive results indicate considerable complexity within the pattern of seismic anisotropy from shear wave splitting beneath Australia No direct correlation between Ø and ...
... the available data recorded within the framework of the many successive deployments have been processed and our new and far more extensive results indicate considerable complexity within the pattern of seismic anisotropy from shear wave splitting beneath Australia No direct correlation between Ø and ...
ppt
... last lecture. Rest of the class will turn in their answer, after which the student asking the question will explain the ...
... last lecture. Rest of the class will turn in their answer, after which the student asking the question will explain the ...
Eastern Klamath Mountains - College of the Siskiyous
... Most divergent boundaries are midocean ridges where two oceanic plates are separated by narrow zones of extensional faults. As the plates pull apart the asthenosphere wells up, undergoes partial melting due to decompression, and produces basalt magmas that rise and erupt to build new oceanic crust ( ...
... Most divergent boundaries are midocean ridges where two oceanic plates are separated by narrow zones of extensional faults. As the plates pull apart the asthenosphere wells up, undergoes partial melting due to decompression, and produces basalt magmas that rise and erupt to build new oceanic crust ( ...
Chapter 19
... Mid-Ocean Ridges • The most prominent features of ocean basins are the mid-ocean ridges, which form underwater mountain ranges that run along the floors of all oceans. • Mid-ocean ridges rise above sea level in only a few places, such as in Iceland. Seamounts • Submerged volcanic mountains that are ...
... Mid-Ocean Ridges • The most prominent features of ocean basins are the mid-ocean ridges, which form underwater mountain ranges that run along the floors of all oceans. • Mid-ocean ridges rise above sea level in only a few places, such as in Iceland. Seamounts • Submerged volcanic mountains that are ...
Next Generation Sunshine State Standards Chapter 7
... century ago, most geologists believed that the geographic positions of the ocean basins and continents were fixed. During the past few decades, however, vast amounts of new data have dramatically changed our understanding of the nature and workings of our planet. Earth scientists now realize that th ...
... century ago, most geologists believed that the geographic positions of the ocean basins and continents were fixed. During the past few decades, however, vast amounts of new data have dramatically changed our understanding of the nature and workings of our planet. Earth scientists now realize that th ...
How Can Hot Spots Help Determine Rate and Direction of Plate
... Hawaiian Island chain to determine the rate of movement of the Pacific Plate. Background: Most volcanoes form along divergent boundaries or near subduction zones; however, the Hawaiian Islands are examples of intra-plate volcanism associated with a hot spot. A hot spot is a stationary area of upwell ...
... Hawaiian Island chain to determine the rate of movement of the Pacific Plate. Background: Most volcanoes form along divergent boundaries or near subduction zones; however, the Hawaiian Islands are examples of intra-plate volcanism associated with a hot spot. A hot spot is a stationary area of upwell ...
Global Science Unit 3 Name_________________ Packet B Per
... The plates move slowly, floating on the mushy, flowing mantle below them. Some of the plates move up to two inches a year. That’s about as fast as a fingernail grows. The surface of some of the plates is mostly ocean, while that of others is made up of entire continents and parts of oceans. Where tw ...
... The plates move slowly, floating on the mushy, flowing mantle below them. Some of the plates move up to two inches a year. That’s about as fast as a fingernail grows. The surface of some of the plates is mostly ocean, while that of others is made up of entire continents and parts of oceans. Where tw ...
GENERAL SCIENCE 1110L LAB LAB 9: Sea Floor Spreading
... 2. Prepare the computer for data collection by opening the file “05 Sea Floor Spreading” in the Earth Science with Vernier folder. 3. Zero the Magnetic Field Sensor. This step removes the effects of the Earth’s magnetic field and any local magnetism from the results. a. Remove anything magnetic from ...
... 2. Prepare the computer for data collection by opening the file “05 Sea Floor Spreading” in the Earth Science with Vernier folder. 3. Zero the Magnetic Field Sensor. This step removes the effects of the Earth’s magnetic field and any local magnetism from the results. a. Remove anything magnetic from ...
Students should know the physical properties (e.g., hardness, color
... of the continents, and in the topography and age of the ocean floor. Continental edges reflect that they were once part of a single large supercontinent that Wegener named Pangaea. Upon the breakup of this supercontinent, the individual continents were moved to their present locations by the forces ...
... of the continents, and in the topography and age of the ocean floor. Continental edges reflect that they were once part of a single large supercontinent that Wegener named Pangaea. Upon the breakup of this supercontinent, the individual continents were moved to their present locations by the forces ...
Lecture10 File
... ridges are plate boundaries, as are the deep ocean trenches around the Pacific. The areas between the zones of earthquakes are rigid, lacking deformation related to earthquakes. These are the Earth’s tectonic plates. For example, the African plate is composed of African continental crust plus ocean ...
... ridges are plate boundaries, as are the deep ocean trenches around the Pacific. The areas between the zones of earthquakes are rigid, lacking deformation related to earthquakes. These are the Earth’s tectonic plates. For example, the African plate is composed of African continental crust plus ocean ...
Mantle Processes
... One way that mantle peridotites may melt is by plastic flow of large regions toward the surface (i.e., lower pressures). ...
... One way that mantle peridotites may melt is by plastic flow of large regions toward the surface (i.e., lower pressures). ...
Earth Science 2: Earthquakes
... ES09‒Rock Cycle discusses the three major types of rock, and E01‒Stress & Strain explores mechanical stress in greater detail. ...
... ES09‒Rock Cycle discusses the three major types of rock, and E01‒Stress & Strain explores mechanical stress in greater detail. ...
MARINE SCIENCE SEMESTER I REVIEW OCEAN EXPLORATION
... 13. Explain why continental drift was not accepted at first. ...
... 13. Explain why continental drift was not accepted at first. ...
Overheads for background on mantle minerals
... pyroxene, amphibole, mica, clay minerals, and olivine. Olivine and pyroxene are the main constituents of the uppermost mantle. • Most silicates are formed from SiO4 tetrahedra (a silicon atom surrounded by four oxygens) arranged in a variety of ways. Exceptions are quartz and feldspar which are soca ...
... pyroxene, amphibole, mica, clay minerals, and olivine. Olivine and pyroxene are the main constituents of the uppermost mantle. • Most silicates are formed from SiO4 tetrahedra (a silicon atom surrounded by four oxygens) arranged in a variety of ways. Exceptions are quartz and feldspar which are soca ...
Seafloor Spreading notes guide 2015
... 1. During World War I, scientists used underwater ________________ to detect the varying depths of the ocean. This is known as “sonar” today. 2. While using this method of echo location, they discovered an underwater system of ____________________ (mountains) and ____________________. 3. In the Atla ...
... 1. During World War I, scientists used underwater ________________ to detect the varying depths of the ocean. This is known as “sonar” today. 2. While using this method of echo location, they discovered an underwater system of ____________________ (mountains) and ____________________. 3. In the Atla ...
Convection Currents
... The earth is over four billion years old, and different events have occurred on earth during different periods of time. (EarthSci: 1) ...
... The earth is over four billion years old, and different events have occurred on earth during different periods of time. (EarthSci: 1) ...
Mining Matters II - The Earth`s Crust Une mine de renseignements II
... used throughout separate and public school boards across Ontario. As well, 200 French language kits were also assembled and are awaiting translation of the Teacher Resource materials before distribution can be completed. In the summer of 2002, PDACMM will fulfill its mandate with the creation of ano ...
... used throughout separate and public school boards across Ontario. As well, 200 French language kits were also assembled and are awaiting translation of the Teacher Resource materials before distribution can be completed. In the summer of 2002, PDACMM will fulfill its mandate with the creation of ano ...
GENERAL ARTICLE A NEW PLATE BOUNDARY NEAR SRI LANKA
... geohazards in Sri Lanka, notably earthquakes, minor tremors and Tsunamis. There are about 13 major plates in the outer shell of the earth and it is the boundaries of these plates that are geologically active. The collision of the plates a t their margins, most notably in subduction zones ( deep tren ...
... geohazards in Sri Lanka, notably earthquakes, minor tremors and Tsunamis. There are about 13 major plates in the outer shell of the earth and it is the boundaries of these plates that are geologically active. The collision of the plates a t their margins, most notably in subduction zones ( deep tren ...
Physical world of mountainss
... There is more than one way to form a mountain. One such way is a result of continents moving upon the surface. As a plate made from oceanic crust is dragged below a lighter, more buoyant, continental plate, its rocks enter the hot core, where they melt. It is not a smooth, gentle process. The rocks ...
... There is more than one way to form a mountain. One such way is a result of continents moving upon the surface. As a plate made from oceanic crust is dragged below a lighter, more buoyant, continental plate, its rocks enter the hot core, where they melt. It is not a smooth, gentle process. The rocks ...
Document
... Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. The theory explains the how and why behind mountains, volcanoes, and earthquakes, as well as how, long ago, similar animals could have lived at the same time on what are now wi ...
... Plate tectonics is the theory that Earth's outer layer is made up of plates, which have moved throughout Earth's history. The theory explains the how and why behind mountains, volcanoes, and earthquakes, as well as how, long ago, similar animals could have lived at the same time on what are now wi ...
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.