unit 2 earth history lecture and study guide
... Paleomagnetism: the study of magnetic fields, as preserved in the magnetic properties of rocks Magnetometer: an instrument used to detect Earth’s magnetism - Magnetic fields that are preserved in ancient lava flows can be used to demonstrate that Earth’s continents have moved over time. Magnetic or ...
... Paleomagnetism: the study of magnetic fields, as preserved in the magnetic properties of rocks Magnetometer: an instrument used to detect Earth’s magnetism - Magnetic fields that are preserved in ancient lava flows can be used to demonstrate that Earth’s continents have moved over time. Magnetic or ...
Plate Tectonics
... rift valley of the ocean ridges and becomes new oceanic crust. The convection currents in the mantle carry the continents away from the ocean ridge and toward deep-sea trenches. There subduction zones develop where the oceanic crust decends into the mantle leading to a complete regeneration of the o ...
... rift valley of the ocean ridges and becomes new oceanic crust. The convection currents in the mantle carry the continents away from the ocean ridge and toward deep-sea trenches. There subduction zones develop where the oceanic crust decends into the mantle leading to a complete regeneration of the o ...
Pole Shift (magnetic)
... commonly called a “pole shift”. There are many theories as to the frequency of the shifts in magnetic poles which range anywhere from 10,000 years to almost 800,000 years. ...
... commonly called a “pole shift”. There are many theories as to the frequency of the shifts in magnetic poles which range anywhere from 10,000 years to almost 800,000 years. ...
Powerpoint
... Lithosphere consists of rigid plates (100 km average; 70 km for ocean & 150 km for continents) Plates move relative to one another by Divergence, Convergence, or Transform motion Formation of Oceanic lithosphere at divergent plate boundaries and is consumed at subduction zone Most earthquake activit ...
... Lithosphere consists of rigid plates (100 km average; 70 km for ocean & 150 km for continents) Plates move relative to one another by Divergence, Convergence, or Transform motion Formation of Oceanic lithosphere at divergent plate boundaries and is consumed at subduction zone Most earthquake activit ...
End of unit exam study guide
... of continental drift and the theory of plate tectonics? Fossil and plant evidence • How does fossil evidence support Wegener’s hypothesis of continental drift? Fossil and plant evidence far away from each other on different ...
... of continental drift and the theory of plate tectonics? Fossil and plant evidence • How does fossil evidence support Wegener’s hypothesis of continental drift? Fossil and plant evidence far away from each other on different ...
planetary geology
... • The study of how these planetary surfaces came to be is called planetary geology – geo for Earth – Planetary for other worlds (including moons) ...
... • The study of how these planetary surfaces came to be is called planetary geology – geo for Earth – Planetary for other worlds (including moons) ...
The Changing Face of the Planet new ppt
... iron line up with the magnetic pole (like little compasses) Polarity reversals occur in parallel bands on opposite sides of the mid-ocean ridges During the past 4 million years, the magnetic poles have reversed themselves 9 times ...
... iron line up with the magnetic pole (like little compasses) Polarity reversals occur in parallel bands on opposite sides of the mid-ocean ridges During the past 4 million years, the magnetic poles have reversed themselves 9 times ...
Sea floor spreading and the effects it has on the world In partnership
... material into rock. The divergent plates constantly produces new rock from Earth’s mantle. The seafloor closer to the divergent plate is much newer than seafloor farther away. As the molten rock hardens from a liquid state, it gains a magnetic signature. Because of the earth’s magnetic ...
... material into rock. The divergent plates constantly produces new rock from Earth’s mantle. The seafloor closer to the divergent plate is much newer than seafloor farther away. As the molten rock hardens from a liquid state, it gains a magnetic signature. Because of the earth’s magnetic ...
Hotspots Unplugged
... Using these approaches is not entirely straightforward. The earth’s magnetic field does not point purely north-south. It has a more complex shape that geophysicists think reflects the flow of liquid iron in the planet’s core. When averaged over several millennia, however, these deviations cancel out. T ...
... Using these approaches is not entirely straightforward. The earth’s magnetic field does not point purely north-south. It has a more complex shape that geophysicists think reflects the flow of liquid iron in the planet’s core. When averaged over several millennia, however, these deviations cancel out. T ...
Plate tect - jenniferwells-lewis
... a divergent plate boundary where continental rifting occurs Figure 2-19 ...
... a divergent plate boundary where continental rifting occurs Figure 2-19 ...
ES Ch 3 Quiz Review `13
... B. Continental Drift (Section 3-1 of Dynamic Earth text, “Evidence for Continental Drift” notes) • Know the meaning and origin of the theory of continental drift and the evidence Wegener used to support the idea. Be able to describe specific examples and how the evidence supports the idea of contine ...
... B. Continental Drift (Section 3-1 of Dynamic Earth text, “Evidence for Continental Drift” notes) • Know the meaning and origin of the theory of continental drift and the evidence Wegener used to support the idea. Be able to describe specific examples and how the evidence supports the idea of contine ...
Study Guide: Unit ESS2-1 and ESS2
... above a sinking slab of oceanic lithosphere (subduction zone). 23. The volcanoes and deep valleys of east Africa are related to a continental rift along which parts of the African continent are beginning to slowly separate. 24. The Aleutian Islands occur at a convergent boundary on a volcanic island ...
... above a sinking slab of oceanic lithosphere (subduction zone). 23. The volcanoes and deep valleys of east Africa are related to a continental rift along which parts of the African continent are beginning to slowly separate. 24. The Aleutian Islands occur at a convergent boundary on a volcanic island ...
Chapter Four – Earth Science
... Additionally, fossils of the reptiles Mesosaurus and Lystrosaurus also have been found on widely separated landmasses. Evidence from the Climate: An island in e Artic Ocean contains fossils of tropical plants. The island at one time must have been close to the equator. Also, scratches in rocks made ...
... Additionally, fossils of the reptiles Mesosaurus and Lystrosaurus also have been found on widely separated landmasses. Evidence from the Climate: An island in e Artic Ocean contains fossils of tropical plants. The island at one time must have been close to the equator. Also, scratches in rocks made ...
Sea-Floor Spreading and Plate Tectonics Project
... ❏ Where does sea-floor spreading occur? Make sure to mention the plate boundary and also list an example of a sea-floor spreading center. ❏ What exactly is happening to the crust at these “spreading centers?” ❏ What type of crust is formed at the spreading centers? Wait a minute… how can we discuss ...
... ❏ Where does sea-floor spreading occur? Make sure to mention the plate boundary and also list an example of a sea-floor spreading center. ❏ What exactly is happening to the crust at these “spreading centers?” ❏ What type of crust is formed at the spreading centers? Wait a minute… how can we discuss ...
Earth Structure - Cal State LA
... earlier ideas, continental drift and seafloor spreading. Continental drift is the movement of continents over the Earth's surface and in their change in position relative to each other. Seafloor spreading is the creation of new oceanic crust at mid-ocean ridges and movement of the crust away from th ...
... earlier ideas, continental drift and seafloor spreading. Continental drift is the movement of continents over the Earth's surface and in their change in position relative to each other. Seafloor spreading is the creation of new oceanic crust at mid-ocean ridges and movement of the crust away from th ...
Plate Tectonics Powerpoint
... At a transform fault boundary, plates grind past each other without destroying the lithosphere. TRANSFORM FAULTS • Most join two segments of a mid-ocean ridge. • At the time of formation, they roughly parallel the direction of plate movement. • They aid the movement of oceanic crustal material. ...
... At a transform fault boundary, plates grind past each other without destroying the lithosphere. TRANSFORM FAULTS • Most join two segments of a mid-ocean ridge. • At the time of formation, they roughly parallel the direction of plate movement. • They aid the movement of oceanic crustal material. ...
Plate Tectonics
... This picture shows a place in Newfoundland where a massive collision actually forced mantle rock on top of the crust, during the collision that formed Pangaea and the Appalachian mountains. This looks down the old plate boundary. ...
... This picture shows a place in Newfoundland where a massive collision actually forced mantle rock on top of the crust, during the collision that formed Pangaea and the Appalachian mountains. This looks down the old plate boundary. ...
The Sea Floor - Mrs. Gallegos Website
... MOR creating cracks in crust called rifts Pressure is released, magma from mantle pushes up oceanic crust to form MOR Cools rapidly and solidifies, new lithosphere (rock) formed at ridges “spreading centers” NEWER ROCK OLDER ROCK ...
... MOR creating cracks in crust called rifts Pressure is released, magma from mantle pushes up oceanic crust to form MOR Cools rapidly and solidifies, new lithosphere (rock) formed at ridges “spreading centers” NEWER ROCK OLDER ROCK ...
Plate Tectonics: The Mechanism
... springs and geysers, and the source of raw material which pushes up the midoceanic ridges and forms new ocean floor. Magma continuously wells upwards at the mid-oceanic ridges (arrows) producing currents of magma flowing in opposite directions and thus generating the forces that pull the sea floor a ...
... springs and geysers, and the source of raw material which pushes up the midoceanic ridges and forms new ocean floor. Magma continuously wells upwards at the mid-oceanic ridges (arrows) producing currents of magma flowing in opposite directions and thus generating the forces that pull the sea floor a ...
Rockmagnetism And Paleomagnetism
... for Fe is most common but also Al, Cr, Mg, and Mn substitution for Fe is possible. Titanomagnetites crystallize in the spinel structure. They can oxidize completely to titanomaghemites thereby retaining this structure. Their formula can be written as Fe(3– x)RTixR3(1–R)O4, where denotes a cation vac ...
... for Fe is most common but also Al, Cr, Mg, and Mn substitution for Fe is possible. Titanomagnetites crystallize in the spinel structure. They can oxidize completely to titanomaghemites thereby retaining this structure. Their formula can be written as Fe(3– x)RTixR3(1–R)O4, where denotes a cation vac ...
No Slide Title
... – where plates slide laterally past each other – roughly parallel to the direction of plate ...
... – where plates slide laterally past each other – roughly parallel to the direction of plate ...
Chapter 10 Whole Notes
... (4) Some rocks have magnetic fields that point north (normal polarity) while other rocks had magnetic fields that pointed south (reversed polarity). Magnetic Reversals When scientists dated these rocks they realized that all rocks placed these periods of normal and reversed polarity in chronological ...
... (4) Some rocks have magnetic fields that point north (normal polarity) while other rocks had magnetic fields that pointed south (reversed polarity). Magnetic Reversals When scientists dated these rocks they realized that all rocks placed these periods of normal and reversed polarity in chronological ...
spreading ridges
... it is heated and partially melted generating magma of ~ andesitic composition the magma rises to the surface because it is less dense than the surrounding mantle rocks ...
... it is heated and partially melted generating magma of ~ andesitic composition the magma rises to the surface because it is less dense than the surrounding mantle rocks ...
Continental Drift, Sea Floor Spreading and Plate
... distribution of fossil to formulate a theory that the continents have moved over the surface of the Earth, sometimes forming large supercontinents and other times forming separate continental masses. He proposed that prior to about 200 million years ago all of the continents formed one large land ma ...
... distribution of fossil to formulate a theory that the continents have moved over the surface of the Earth, sometimes forming large supercontinents and other times forming separate continental masses. He proposed that prior to about 200 million years ago all of the continents formed one large land ma ...
Geomagnetic reversal
A geomagnetic reversal is a change in a planet's magnetic field such that the positions of magnetic north and magnetic south are interchanged. The Earth's field has alternated between periods of normal polarity, in which the direction of the field was the same as the present direction, and reverse polarity, in which the field was the opposite. These periods are called chrons. The time spans of chrons are randomly distributed with most being between 0.1 and 1 million years with an average of 450,000 years. Most reversals are estimated to take between 1,000 and 10,000 years.The latest one, the Brunhes–Matuyama reversal, occurred 780,000 years ago;and may have happened very quickly, within a human lifetime. A brief complete reversal, known as the Laschamp event, occurred only 41,000 years ago during the last glacial period. That reversal lasted only about 440 years with the actual change of polarity lasting around 250 years. During this change the strength of the magnetic field dropped to 5% of its present strength. Brief disruptions that do not result in reversal are called geomagnetic excursions.