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Planet Earth - Topic 4 (ANSWERS)
... Most of the places were thought to be covered by glaciers. 5. What does SONAR stands for? When is it used? p. 386 Sound Navigation and Ranging. It is used to study the surface at the bottom of the ocean. 6. When scientists used sonar, what did they discover about the oceans? They discovered that the ...
... Most of the places were thought to be covered by glaciers. 5. What does SONAR stands for? When is it used? p. 386 Sound Navigation and Ranging. It is used to study the surface at the bottom of the ocean. 6. When scientists used sonar, what did they discover about the oceans? They discovered that the ...
Paleomagnetism: Divergent Boundary
... During World War II sonar was used to uncover submarines. Vast underwater mountain chains called ocean ridges were also discovered. They also discovered deep sea trenches which are narrow elongated depressions in the seafloor with very steep sides. The deepest trench is in the Pacific Ocean which is ...
... During World War II sonar was used to uncover submarines. Vast underwater mountain chains called ocean ridges were also discovered. They also discovered deep sea trenches which are narrow elongated depressions in the seafloor with very steep sides. The deepest trench is in the Pacific Ocean which is ...
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... Wegener (1912) – Continental drift: continents rafting through the upper mantle. Menard (1952), Dietz (1952) – fracture zones Irving (1956), Runcorn (1956) – used paleomagnetic data to show polar wandering and motion between plates. Ewing and Heezen (1956) – presence of a rift valley at crest of mos ...
... Wegener (1912) – Continental drift: continents rafting through the upper mantle. Menard (1952), Dietz (1952) – fracture zones Irving (1956), Runcorn (1956) – used paleomagnetic data to show polar wandering and motion between plates. Ewing and Heezen (1956) – presence of a rift valley at crest of mos ...
Notes 9-4 Sea Floor Spreading Name p. 331
... At DOTs, subduction allows part of the ocean floor to sink back into the mantle in a process that takes tens of _____________________ of years. Subduction & Earth’s Oceans Subduction & sea-floor spreading can change the ______________ & __________________ of the oceans. Pacific Ocean: it is ________ ...
... At DOTs, subduction allows part of the ocean floor to sink back into the mantle in a process that takes tens of _____________________ of years. Subduction & Earth’s Oceans Subduction & sea-floor spreading can change the ______________ & __________________ of the oceans. Pacific Ocean: it is ________ ...
Theory Development
... 1962 – Vine-Morley-Matthews’ hypothesis was further evidence that built on Harry Hess’ sea floor spreading theory. Vine, along with Lawrence W. Morley and Drummond Matthews, developed the theory that the sea floor was spreading equally away from the mid-ocean ridge. Their idea was that the magnetic ...
... 1962 – Vine-Morley-Matthews’ hypothesis was further evidence that built on Harry Hess’ sea floor spreading theory. Vine, along with Lawrence W. Morley and Drummond Matthews, developed the theory that the sea floor was spreading equally away from the mid-ocean ridge. Their idea was that the magnetic ...
Chapter 4 Plate tectonics Review Game
... from drilling samples. The age of the rocks near the ridge are younger than rocks that are further away from the ...
... from drilling samples. The age of the rocks near the ridge are younger than rocks that are further away from the ...
Van Allen radiation belt
... hasn’t moved greatly. Go back 30 million years, however, and substantial deviations occur. Calculations of polar wandering formed one of the first important pieces of evidence for continental drift. ...
... hasn’t moved greatly. Go back 30 million years, however, and substantial deviations occur. Calculations of polar wandering formed one of the first important pieces of evidence for continental drift. ...
sci-10-17-1 - St John Brebeuf
... gives a record of the strength and direction of Earth’s magnetic field over time. This record can then be compared to measurements across the sea floor to make inferences about the age of sea floor rock. ...
... gives a record of the strength and direction of Earth’s magnetic field over time. This record can then be compared to measurements across the sea floor to make inferences about the age of sea floor rock. ...
Plate Tectonics
... plate boundaries extremely well. Here is a clickable map of current volcanic activity on Earth. ...
... plate boundaries extremely well. Here is a clickable map of current volcanic activity on Earth. ...
Plate Tectonics Name
... Name: __________________ Block: __________ Part C: Converging Boundaries and Subduction Zones Deep ocean trenches represent zones of subduction where ocean-floor rock sinks into the mantle. Evidence for this is the distribution of intermediate and deep focus earthquakes. Earthquakes occur only in r ...
... Name: __________________ Block: __________ Part C: Converging Boundaries and Subduction Zones Deep ocean trenches represent zones of subduction where ocean-floor rock sinks into the mantle. Evidence for this is the distribution of intermediate and deep focus earthquakes. Earthquakes occur only in r ...
A1,A2 and A3 : Introduction to Geophysics
... ●Oceanic crust is denser than continental crust, and can be subducted back into the mantle. No oceanic crust older than 200 million years is found on Earth. ●Less dense continental crust is resistant to subduction and shows a continuum of ages back to more than 4 billion years (oldest known rocks ar ...
... ●Oceanic crust is denser than continental crust, and can be subducted back into the mantle. No oceanic crust older than 200 million years is found on Earth. ●Less dense continental crust is resistant to subduction and shows a continuum of ages back to more than 4 billion years (oldest known rocks ar ...
Chapter 17- Plate Tectonics
... side of ocean (matching coastlines) • Continental drift (Wegener)- Earth’s continents had once been joined as Pangaea ...
... side of ocean (matching coastlines) • Continental drift (Wegener)- Earth’s continents had once been joined as Pangaea ...
Sea Floor Spreading The Mid-ocean Ridge
... while pushing older rocks away Moves like a conveyor belt from the ridge. carrying continents with it. ...
... while pushing older rocks away Moves like a conveyor belt from the ridge. carrying continents with it. ...
Plate Tectonics of the Pacific Northwest Ocean Basin
... the Juan de Fuca Ridge) compare to the pattern you observe on going east from S7? 5. What probably caused this pattern you described in question 4? 6. How old is the oldest basalt found during this voyage? Based on this information calculate the average rate of spreading that is taking place at the ...
... the Juan de Fuca Ridge) compare to the pattern you observe on going east from S7? 5. What probably caused this pattern you described in question 4? 6. How old is the oldest basalt found during this voyage? Based on this information calculate the average rate of spreading that is taking place at the ...
Seafloor Spreading and Paleomagnetism
... Subduction Zone: When one plate sinks beneath another. ...
... Subduction Zone: When one plate sinks beneath another. ...
Plate Tectonic Theory
... Cox and Dallrymple: Magnetic Reversals from all continents record changes in Earth’s magnetic field at the same time ...
... Cox and Dallrymple: Magnetic Reversals from all continents record changes in Earth’s magnetic field at the same time ...
Foundations* - Chapter 9, 10, and 11 Exam
... 11. At a(n) ______________________________ boundary, oceanic lithosphere plunges beneath an overriding continental plate. 12. A chain of small volcanic islands that forms when two oceanic plates converge, one descending beneath the other, is called a(n) ____________________. 13. A(n) _______________ ...
... 11. At a(n) ______________________________ boundary, oceanic lithosphere plunges beneath an overriding continental plate. 12. A chain of small volcanic islands that forms when two oceanic plates converge, one descending beneath the other, is called a(n) ____________________. 13. A(n) _______________ ...
Learning about Space Weather - Laboratory for Atmospheric and
... With just one satellite, scientists can only measure magnetic fields at one point in space, and that’s just what they have done. And with one satellite at a time, they have discovered many things about the Sun. But really, scientists need to measure the interplanetary magnetic field and the solar wi ...
... With just one satellite, scientists can only measure magnetic fields at one point in space, and that’s just what they have done. And with one satellite at a time, they have discovered many things about the Sun. But really, scientists need to measure the interplanetary magnetic field and the solar wi ...
Science 8
... B. Choose the best answer to complete each section. ____1. At what rate do scientists say the Earth’s plates move? a. 1cm to 12 cm a century b. 1cm to 12 cm a decade c. 1cm to 12 cm a year ____2. Why does seafloor spreading occur? a. Because earthquakes break apart the ocean floor b. Because molten ...
... B. Choose the best answer to complete each section. ____1. At what rate do scientists say the Earth’s plates move? a. 1cm to 12 cm a century b. 1cm to 12 cm a decade c. 1cm to 12 cm a year ____2. Why does seafloor spreading occur? a. Because earthquakes break apart the ocean floor b. Because molten ...
Science 8
... B. Choose the best answer to complete each section. ____1. At what rate do scientists say the Earth’s plates move? a. 1cm to 12 cm a century b. 1cm to 12 cm a decade c. 1cm to 12 cm a year ____2. Why does seafloor spreading occur? a. Because earthquakes break apart the ocean floor b. Because molten ...
... B. Choose the best answer to complete each section. ____1. At what rate do scientists say the Earth’s plates move? a. 1cm to 12 cm a century b. 1cm to 12 cm a decade c. 1cm to 12 cm a year ____2. Why does seafloor spreading occur? a. Because earthquakes break apart the ocean floor b. Because molten ...
Continental Drift
... older islands, carried along with the sea floor away from the zone of upward flow at the ridge or weakness, are older, inactive volcanically, and, among the very oldest, may have 'subsided' to become sub-surface seamounts or guyots. ...
... older islands, carried along with the sea floor away from the zone of upward flow at the ridge or weakness, are older, inactive volcanically, and, among the very oldest, may have 'subsided' to become sub-surface seamounts or guyots. ...
Chapter 2
... • Magnetic polarity reverses – Every several thousand to tens of millions of years – Orientation of magnetic field switches from north (normal) polarity to south (reverse) polarity – Reverses take few thousand years to complete, with complex field present during switch • Changes in magnetic field ar ...
... • Magnetic polarity reverses – Every several thousand to tens of millions of years – Orientation of magnetic field switches from north (normal) polarity to south (reverse) polarity – Reverses take few thousand years to complete, with complex field present during switch • Changes in magnetic field ar ...
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.