Background Information for Plate Tectonics Rock Formation
... up the lower asthenosphere. This materials becomes less dense than the material above it and it starts to rise. Gravity pulls the cooler material down towards the core. Because the lower mantle and lithosphere are solid the asthenosphere continuously flows up and down. 4. These convection currents i ...
... up the lower asthenosphere. This materials becomes less dense than the material above it and it starts to rise. Gravity pulls the cooler material down towards the core. Because the lower mantle and lithosphere are solid the asthenosphere continuously flows up and down. 4. These convection currents i ...
Inside the earth - Northside Middle School
... the core—based on chemical composition. Less dense compounds make up the crust and mantle. Denser compounds make up the core. ...
... the core—based on chemical composition. Less dense compounds make up the crust and mantle. Denser compounds make up the core. ...
Geology and the Earth (Con`t.)
... Density = medium Composition is silicon and oxygen-based but also includes iron and magnesium. Consistency is plastic. Contains two parts, Upper and Lower Mantle. CORE - Inner layer Density = high Composition is primarily iron and nickel. Contains two parts Inner core is solid. Outer core is liquid. ...
... Density = medium Composition is silicon and oxygen-based but also includes iron and magnesium. Consistency is plastic. Contains two parts, Upper and Lower Mantle. CORE - Inner layer Density = high Composition is primarily iron and nickel. Contains two parts Inner core is solid. Outer core is liquid. ...
Powerpoint
... Hypothesis Geological phenomena associated with continental collisions will create extensive new or enlarged mountain ranges in several regions in the future. ...
... Hypothesis Geological phenomena associated with continental collisions will create extensive new or enlarged mountain ranges in several regions in the future. ...
Bell Work: 10/13/09
... First, by studying how the Earth worked in the past, we can better understand how it is working today. This helps us understand our effects on the environment and its potential effects on us. For example, by understanding where earthquakes have occurred in the past, we have a much better idea of whe ...
... First, by studying how the Earth worked in the past, we can better understand how it is working today. This helps us understand our effects on the environment and its potential effects on us. For example, by understanding where earthquakes have occurred in the past, we have a much better idea of whe ...
What aspects of the downgoing plate might be important in
... Donna Shillington Sarah Penniston-Dorland Peter van Keken ...
... Donna Shillington Sarah Penniston-Dorland Peter van Keken ...
Tectonic landscapes- Understanding hotspots
... GCSE- Tectonic landscapes- Understanding hotspots Some volcanoes do not occur on plate boundaries. These volcanoes are formed over hotspots. These are fixed points in the mantle that generate intense heat (in a mantle plume). Small, long lasting, exceptionally hot areas of magma exist under the Eart ...
... GCSE- Tectonic landscapes- Understanding hotspots Some volcanoes do not occur on plate boundaries. These volcanoes are formed over hotspots. These are fixed points in the mantle that generate intense heat (in a mantle plume). Small, long lasting, exceptionally hot areas of magma exist under the Eart ...
Chapter 7_Part 1
... America and Africa • Apparently contiguous mountain ranges • Similar shapes of coastlines of S. America and Africa! Kump et al (2000) ...
... America and Africa • Apparently contiguous mountain ranges • Similar shapes of coastlines of S. America and Africa! Kump et al (2000) ...
Tanya Shavalia The Farallon and Juan de Fuca Plates leaving only
... The Farallon and Juan de Fuca Plates Much of the geology of western North America has been shaped by the interaction of the Kula, Farallon and Pacific plates. However, reconstructing plate motions beyond the Mesozoic period is extremely difficult due to plate loss by subduction. The Farallon plate i ...
... The Farallon and Juan de Fuca Plates Much of the geology of western North America has been shaped by the interaction of the Kula, Farallon and Pacific plates. However, reconstructing plate motions beyond the Mesozoic period is extremely difficult due to plate loss by subduction. The Farallon plate i ...
7.1.2 Study: The Mantle and Crust
... Use the spaces below to take notes on the key concepts presented in this study. Main Idea #1: Scientists can collect information on the surface of Earth that gives them a hint as to what is below the surface. ...
... Use the spaces below to take notes on the key concepts presented in this study. Main Idea #1: Scientists can collect information on the surface of Earth that gives them a hint as to what is below the surface. ...
Plate Boundaries
... The continents cannot be sucked into the trench because their granite rocks. The two continents collide! ...
... The continents cannot be sucked into the trench because their granite rocks. The two continents collide! ...
8thGrScience
... a. ________ Historical data and observations such as fossil distribution, paleomagnetism, continental drift and seafloor spreading contributed to the theory of plate tectonics. The rigid tectonic plates move with the molten rock and magma beneath them in the upper mantle. b. ________ Convection curr ...
... a. ________ Historical data and observations such as fossil distribution, paleomagnetism, continental drift and seafloor spreading contributed to the theory of plate tectonics. The rigid tectonic plates move with the molten rock and magma beneath them in the upper mantle. b. ________ Convection curr ...
How and Where Volcanoes Form
... locations. Examine maps and 3D diagrams to explore volcanism at plate boundaries. Keycode: ES0901 ...
... locations. Examine maps and 3D diagrams to explore volcanism at plate boundaries. Keycode: ES0901 ...
Lab study suggests small layer of water, CO2 and silicate
... the asthenosphere debate—but as Evans suggests, the team in a News & Views piece in the same the geo-science community now seems well journal issue. positioned to finally explain surface plate movement. For many years geo-scientists have debated the nature of the asthenosphere—the upper part of the ...
... the asthenosphere debate—but as Evans suggests, the team in a News & Views piece in the same the geo-science community now seems well journal issue. positioned to finally explain surface plate movement. For many years geo-scientists have debated the nature of the asthenosphere—the upper part of the ...
Geology * Part II - Hatboro
... trembling that results from the movement of rock beneath Earth’s surface 2. Earthquakes occur because of stress built up in rock. Stress is a force that acts on a rock to change its shape or volume. These stresses cause faults (a break or crack in Earth’s lithosphere (underground) along which the ro ...
... trembling that results from the movement of rock beneath Earth’s surface 2. Earthquakes occur because of stress built up in rock. Stress is a force that acts on a rock to change its shape or volume. These stresses cause faults (a break or crack in Earth’s lithosphere (underground) along which the ro ...
Earthquake Causes
... This text is provided courtesy of OLogy, the American Museum of Natural History's website for kids. What Causes the Earth to Shake? Tsunamis like the one in Samoa are triggered by large undersea earthquakes. To understand how tsunamis form, let's first take a look at what causes earthquakes. Most ea ...
... This text is provided courtesy of OLogy, the American Museum of Natural History's website for kids. What Causes the Earth to Shake? Tsunamis like the one in Samoa are triggered by large undersea earthquakes. To understand how tsunamis form, let's first take a look at what causes earthquakes. Most ea ...
Lecture 27 April 3, 2006
... understanding of the dynamic Earth. Modern digital seismic arrays will produce three-dimensional images of North America's continental crust and the deeper mantle on which it "floats". ...
... understanding of the dynamic Earth. Modern digital seismic arrays will produce three-dimensional images of North America's continental crust and the deeper mantle on which it "floats". ...
Mapping Volcanoes
... d. Earthquakes can happen where old plate boundaries or other tectonic stresses used to be. For example the Magnitude 7 to 8 New Madrid earthquakes which happened in Missouri in 1811 and 1812 were due to very old tectonic stresses that built up when what is now North America was part of the supercon ...
... d. Earthquakes can happen where old plate boundaries or other tectonic stresses used to be. For example the Magnitude 7 to 8 New Madrid earthquakes which happened in Missouri in 1811 and 1812 were due to very old tectonic stresses that built up when what is now North America was part of the supercon ...
California`s Geologic History:
... There are also a lot of metamorphic rocks in California due to all of the volcanic activity Middle History of California: Mesozoic to Cenozoic A major change in tectonic plate movement occurred in the Mesozoic era about 250 million years ago. California turned into a convergent boundary instea ...
... There are also a lot of metamorphic rocks in California due to all of the volcanic activity Middle History of California: Mesozoic to Cenozoic A major change in tectonic plate movement occurred in the Mesozoic era about 250 million years ago. California turned into a convergent boundary instea ...
Core and Mantle Studies
... “(J. Louie) The earth is divided into four main layers: the inner core, outer core, mantle, and crust. The core is composed mostly of iron (Fe) and is so hot that the outer core is molten, with about 10% sulphur (S). The inner core is under such extreme pressure that it remains solid. Most of the Ea ...
... “(J. Louie) The earth is divided into four main layers: the inner core, outer core, mantle, and crust. The core is composed mostly of iron (Fe) and is so hot that the outer core is molten, with about 10% sulphur (S). The inner core is under such extreme pressure that it remains solid. Most of the Ea ...
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.