On the magnetic field required for driving the observed angular
... oscillations (Schüssler, 1981; Yoshimura, 1981), and we deduce the magnetic field that produces it. In this tentative foray we ignore viscous and Ohmic diffusion, be they laminar or turbulent. We also ignore meridional advection and its contribution to the distortion of the magnetic field. We recog ...
... oscillations (Schüssler, 1981; Yoshimura, 1981), and we deduce the magnetic field that produces it. In this tentative foray we ignore viscous and Ohmic diffusion, be they laminar or turbulent. We also ignore meridional advection and its contribution to the distortion of the magnetic field. We recog ...
Plate Tectonics
... Boundaries are places where two plates are pushing toward, pulling away, or sliding past one another ...
... Boundaries are places where two plates are pushing toward, pulling away, or sliding past one another ...
Ch 3 ppt
... • hot magma rises from mantle to form new crust • cold crust subducts into the mantle at oceanic trenches, where it is heated and recycled ...
... • hot magma rises from mantle to form new crust • cold crust subducts into the mantle at oceanic trenches, where it is heated and recycled ...
Lecture 2: Before we get to PLATE TECTONICS…..
... Our magnetic field protects us from UV radiation by deflecting low-energy charged particles around the Earth, but some particles become trapped in outer Van Allen radiation belts. ...
... Our magnetic field protects us from UV radiation by deflecting low-energy charged particles around the Earth, but some particles become trapped in outer Van Allen radiation belts. ...
Power Point print view
... to form the Atlantic Ocean • supposedly, tidal forces pulled formerly polar continents toward the equator, • when Earth captured the Moon about 100 million years ago ...
... to form the Atlantic Ocean • supposedly, tidal forces pulled formerly polar continents toward the equator, • when Earth captured the Moon about 100 million years ago ...
Ch. 4 Plate Tectonics This is a satellite image of the San Francisco
... core force the solid inner core to spin at a slightly faster rate than the rest of the planet. These currents in the outer core also create Earth's magnetic field, which causes the planet to act like a giant bar magnet. ...
... core force the solid inner core to spin at a slightly faster rate than the rest of the planet. These currents in the outer core also create Earth's magnetic field, which causes the planet to act like a giant bar magnet. ...
Evidence for Sea-Floor Spreading
... In the 1960s, Harry Hess examined maps of the mid ocean ridge. He proposed that the ocean floors move like conveyor belts, carrying the continents with them. ...
... In the 1960s, Harry Hess examined maps of the mid ocean ridge. He proposed that the ocean floors move like conveyor belts, carrying the continents with them. ...
Class notes (*) - LSU Geology & Geophysics
... both crust and cold mantle together as one solid block (0100km) asthenoshphere or plastic,ductile, layer also within the mantle (100km ...
... both crust and cold mantle together as one solid block (0100km) asthenoshphere or plastic,ductile, layer also within the mantle (100km ...
plate tectonics - Science with Ms. Reathaford!
... Paleomagnetism (study of magnetic record of Earth’s rocks) proved that magnetic field reversal occurs over time, with magnetic patterns being symmetric around the midocean ridges ...
... Paleomagnetism (study of magnetic record of Earth’s rocks) proved that magnetic field reversal occurs over time, with magnetic patterns being symmetric around the midocean ridges ...
1 Possible Test Questions Unit 10 TECTONIC
... 21. According to Dr. Hess, what would happen to the seafloor away from the ridge? ...
... 21. According to Dr. Hess, what would happen to the seafloor away from the ridge? ...
Plate Tectonics Review
... Magnetic striping patterns on the floor of the Atlantic Ocean show mirror images on either side of the Mid-Atlantic ridge, suggesting the sea floor is spreading outwards from the ridge. ...
... Magnetic striping patterns on the floor of the Atlantic Ocean show mirror images on either side of the Mid-Atlantic ridge, suggesting the sea floor is spreading outwards from the ridge. ...
Ch 10 - USD305.com
... older than 540 million yrs • Shields-rocks w/in cratons that have been exposed at Earth’s surface • Rifting-process by which Earth’s crust ...
... older than 540 million yrs • Shields-rocks w/in cratons that have been exposed at Earth’s surface • Rifting-process by which Earth’s crust ...
Study Guide / Notes 11
... small jumps in velocity occur within this zone may be due to phase changes or changes in mineral structure. (see p. 232) ...
... small jumps in velocity occur within this zone may be due to phase changes or changes in mineral structure. (see p. 232) ...
GEOL_106_lecture_03_..
... Plate velocities determined from the rate of sea floor spreading or by making measurements across a plate boundary are only relative velocities. That is we know the velocity of one plate only if we can assume that the adjacent plate is not moving. In order to determine absolute plate velocities, we ...
... Plate velocities determined from the rate of sea floor spreading or by making measurements across a plate boundary are only relative velocities. That is we know the velocity of one plate only if we can assume that the adjacent plate is not moving. In order to determine absolute plate velocities, we ...
File
... RATS 1-10 DUE FRIDAY REVIEW QUESTIONS 1. What key evidence did Alfred Wegener use to support his hypothesis of continental drift? The “jigsaw puzzle” fit of continents at their margins, similar rock types on separated continents, and data from paleoclimatology and paleontology data. Pg.639 p1 & fig. ...
... RATS 1-10 DUE FRIDAY REVIEW QUESTIONS 1. What key evidence did Alfred Wegener use to support his hypothesis of continental drift? The “jigsaw puzzle” fit of continents at their margins, similar rock types on separated continents, and data from paleoclimatology and paleontology data. Pg.639 p1 & fig. ...
Continental Drift
... is at the north but this has not always been the case. At irregular intervals the Earth’s magnetic poles “flip”. ...
... is at the north but this has not always been the case. At irregular intervals the Earth’s magnetic poles “flip”. ...
Adv-Plate-Tectonics-Essay-formative-assess
... 2. What is the major evidence that sea-floor spreading creates new lithosphere? Explain your answer. Answers will vary. Sample answer: Molten rock at mid-ocean ridges has magnetized minerals that align with Earth’s magnetic field. When the Earth’s magnetic field reverses, the magnetized minerals ali ...
... 2. What is the major evidence that sea-floor spreading creates new lithosphere? Explain your answer. Answers will vary. Sample answer: Molten rock at mid-ocean ridges has magnetized minerals that align with Earth’s magnetic field. When the Earth’s magnetic field reverses, the magnetized minerals ali ...
Chapter 7
... • Thermal plumes do not all produce triple junctions. • Hot spots are present across the globe. If the lava from the thermal plume makes its way to the surface, volcanic activity may result. • As a tectonic plate moves over a hot spot (at a rate as high as 10 cm per year), a chain of volcanoes is fo ...
... • Thermal plumes do not all produce triple junctions. • Hot spots are present across the globe. If the lava from the thermal plume makes its way to the surface, volcanic activity may result. • As a tectonic plate moves over a hot spot (at a rate as high as 10 cm per year), a chain of volcanoes is fo ...
7 Grade: Ch. 10 STUDY GUIDE KEY
... 1. What was Wegener’s hypothesis of continental drift? The continents were once joined together in a single landmass 2. What is Pangaea? Pangaea is the name of the supercontinent that existed millions of years ago 3. What is a fossil? Any trace of an ancient organism that has been preserved in rock ...
... 1. What was Wegener’s hypothesis of continental drift? The continents were once joined together in a single landmass 2. What is Pangaea? Pangaea is the name of the supercontinent that existed millions of years ago 3. What is a fossil? Any trace of an ancient organism that has been preserved in rock ...
PowerPoint - Cal State LA - Instructional Web Server
... – Age of seafloor – Paleomagnetism – Heat flow Theory combining continental drift and seafloor spreading termed “Plate Tectonics” ...
... – Age of seafloor – Paleomagnetism – Heat flow Theory combining continental drift and seafloor spreading termed “Plate Tectonics” ...
Earth Interior
... Background: On Earth one needs a sensitive needle to detect magnetic forces, and out in space they are usually much, much weaker. But beyond the dense atmosphere, such forces have a much bigger role, and a region exists around the Earth where they dominate the environment, a region known as the Eart ...
... Background: On Earth one needs a sensitive needle to detect magnetic forces, and out in space they are usually much, much weaker. But beyond the dense atmosphere, such forces have a much bigger role, and a region exists around the Earth where they dominate the environment, a region known as the Eart ...
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.