Section 1 Earth`s Structure - Midway Middle School Science
... rocks! The pattern they observed on one side of the ridge was a mirror image of the pattern on the other side of the ridge, as shown in Figure 6. Why were the rocks magnetized? What could have caused this pattern in the rocks? The scientists determined that the magnetism of the rocks aligned with Ea ...
... rocks! The pattern they observed on one side of the ridge was a mirror image of the pattern on the other side of the ridge, as shown in Figure 6. Why were the rocks magnetized? What could have caused this pattern in the rocks? The scientists determined that the magnetism of the rocks aligned with Ea ...
Mid-Atlantic Ridge, and Magnetic Polarity Reversal
... suggested that times existed when the magnetization had the opposite direction from today's direction. All sorts of explanation were proposed, but in the end the only one that passed all tests was that in the distant past, the magnetic polarity of the Earth was sometimes reversed. In the ocean floor ...
... suggested that times existed when the magnetization had the opposite direction from today's direction. All sorts of explanation were proposed, but in the end the only one that passed all tests was that in the distant past, the magnetic polarity of the Earth was sometimes reversed. In the ocean floor ...
plates notes - Red Hook Central Schools
... 2. _____________________ first proposed the idea of continental drift in the early 1900’s. 3. Describe the evidence for continental drift below: ...
... 2. _____________________ first proposed the idea of continental drift in the early 1900’s. 3. Describe the evidence for continental drift below: ...
Slide 1
... lava forming at the ridges picks up the current magnetism, then gets pushed out of the way as newer lava forms ...
... lava forming at the ridges picks up the current magnetism, then gets pushed out of the way as newer lava forms ...
Name: Date: Period: ______
... The age of ocean crust and thickness of oceanfloor sediments increases with distance from an ocean ridge. ...
... The age of ocean crust and thickness of oceanfloor sediments increases with distance from an ocean ridge. ...
Quiz 1 (Key)
... Multiple Choice: Answer each question with the one most appropriate answer (10 pts) 1. Reversals of the Earth’s magnetic poles: a) are not well understood; b) provide evidence, through paleomagnetism, for seafloor spreading; c) are recorded in the permanent magnetism of lavas millions of years old; ...
... Multiple Choice: Answer each question with the one most appropriate answer (10 pts) 1. Reversals of the Earth’s magnetic poles: a) are not well understood; b) provide evidence, through paleomagnetism, for seafloor spreading; c) are recorded in the permanent magnetism of lavas millions of years old; ...
Earth Science Library wk 8.cwk
... Lithosphere is consumed at subduction zones. Oceanic crust is denser than continental crust, thus where oceanic crust meets continental crust the oceanic plate dives under the continent. Where two oceanic plates collide, one usually dives under the other. ...
... Lithosphere is consumed at subduction zones. Oceanic crust is denser than continental crust, thus where oceanic crust meets continental crust the oceanic plate dives under the continent. Where two oceanic plates collide, one usually dives under the other. ...
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 ____ ...
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 ____ ...
hsess1-5
... Examples include evidence of the ages oceanic crust increasing with distance from mid-ocean ridges (a result of plate spreading) and the ages of North American continental crust increasing with distance away from a central ancient core (a result of past plate interactions).] ...
... Examples include evidence of the ages oceanic crust increasing with distance from mid-ocean ridges (a result of plate spreading) and the ages of North American continental crust increasing with distance away from a central ancient core (a result of past plate interactions).] ...
Chapter12 EarthsInterior
... gravity readings. –Positive anomaly: gravity reading higher than the regional gravity readings –Negative anomaly: gravity readings lower than the regional gravity readings ...
... gravity readings. –Positive anomaly: gravity reading higher than the regional gravity readings –Negative anomaly: gravity readings lower than the regional gravity readings ...
9.5 Mechanisms of Plate Motion
... Strongest new evidence came from ocean drilling (new technology) in the 1960’s Geochronology = seafloor age ...
... Strongest new evidence came from ocean drilling (new technology) in the 1960’s Geochronology = seafloor age ...
Virtual geomagnetic poles
... Interior area: Declination = N10°E (= +10°), Inclination = +85° a. Calculate the latitudes of each area in the Early Jurassic. b. Estimate the minimum velocity of the accreted terrane relative to the interior site between 200 and 100 Ma. (in units of centimeters/year). Explain why this is a minimum ...
... Interior area: Declination = N10°E (= +10°), Inclination = +85° a. Calculate the latitudes of each area in the Early Jurassic. b. Estimate the minimum velocity of the accreted terrane relative to the interior site between 200 and 100 Ma. (in units of centimeters/year). Explain why this is a minimum ...
Plate Tectonics
... evidence = the same fossils were found on different continents that would have been joined during Pangaea. Example = Mesosaurus (S. America and W. Africa) • Climate ...
... evidence = the same fossils were found on different continents that would have been joined during Pangaea. Example = Mesosaurus (S. America and W. Africa) • Climate ...
Chapter 9 WS #2
... hemisphere after the breakup of the original supercontinent is A. Pangaea B. Laurasia C. Gondwanaland D. Micronesia 38. Iceland is an example of a(n) A. above sea-level expression of a divergent boundary. B. stalled convergent boundary. C. intraplate hot spot. D. extinct volcano. 39. The best possib ...
... hemisphere after the breakup of the original supercontinent is A. Pangaea B. Laurasia C. Gondwanaland D. Micronesia 38. Iceland is an example of a(n) A. above sea-level expression of a divergent boundary. B. stalled convergent boundary. C. intraplate hot spot. D. extinct volcano. 39. The best possib ...
Earth`s Interior Information- Core-Innermost layer Inner Core
... Mantle-Is solid rock that behaves like plastic. It moves, has intense pressure at bottom layer, convection currents flow up towards the lithosphere Asthenosphere-Not liquid, but there is melted rock, carries the lithosphere, moves slowly Lithosphere-broken into giant plates that fit around the globe ...
... Mantle-Is solid rock that behaves like plastic. It moves, has intense pressure at bottom layer, convection currents flow up towards the lithosphere Asthenosphere-Not liquid, but there is melted rock, carries the lithosphere, moves slowly Lithosphere-broken into giant plates that fit around the globe ...
Development of the Theory of Plate Tectonics
... compressed into a single protocontinent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. He believed that Pangaea was intact until the late Carboniferous period, about 300 million years ago, when it began to break up and drift apar ...
... compressed into a single protocontinent which he called Pangaea (meaning "all lands"), and over time they have drifted apart into their current distribution. He believed that Pangaea was intact until the late Carboniferous period, about 300 million years ago, when it began to break up and drift apar ...
No Slide Title
... If you put the continents together they fit like a jigsaw puzzle. He called this_________________. ...
... If you put the continents together they fit like a jigsaw puzzle. He called this_________________. ...
Today`s Warm-Up Friday, January 10
... • Lithosphere: solid, rigid, tectonic plates (crust and upper mantle) • Asthenosphere: solid, plastic, convection currents (middle mantle) • Mesosphere: solid, rigid (lower mantle) ...
... • Lithosphere: solid, rigid, tectonic plates (crust and upper mantle) • Asthenosphere: solid, plastic, convection currents (middle mantle) • Mesosphere: solid, rigid (lower mantle) ...
Name: Date:______ Period:______ Lab – Sea Floor Spreading
... Introduction: Sea floor spreading is the hypothesis that the sea floor moves sideways away from the mid ocean ridge. The two sides of the ridge are moving in opposite directions leaving a rift valley that is the site of submarine volcanic eruptions. Molten rock from a magma chamber only 1 to 2 kilom ...
... Introduction: Sea floor spreading is the hypothesis that the sea floor moves sideways away from the mid ocean ridge. The two sides of the ridge are moving in opposite directions leaving a rift valley that is the site of submarine volcanic eruptions. Molten rock from a magma chamber only 1 to 2 kilom ...
Plate Tectonics - Department of Physics and Astronomy
... have not eroded the softer rocks away like the Rockies have ...
... have not eroded the softer rocks away like the Rockies have ...
Plate Tectonics
... -Fossils of same plant & animal species found on opposite sides of oceans. -Same types of rocks & layers found on coasts on opposite sides of oceans. -Evidence of same climactic conditions on several continents. ...
... -Fossils of same plant & animal species found on opposite sides of oceans. -Same types of rocks & layers found on coasts on opposite sides of oceans. -Evidence of same climactic conditions on several continents. ...
9.4 Testing Plate Tectonics 9.5 Mechanisms of Plate Motions
... magnetic poles at the time the rock became magnetized. • Normal polarity—when rocks show the same magnetism as the present magnetic field • Reverse polarity—when rocks show the opposite magnetism as the present magnetic field ...
... magnetic poles at the time the rock became magnetized. • Normal polarity—when rocks show the same magnetism as the present magnetic field • Reverse polarity—when rocks show the opposite magnetism as the present magnetic field ...
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.