Passive margin
... This explains why rocks are older and sediment is thicker as you move away from the ridge This also explains the magnetic stripes found in the sea floor ...
... This explains why rocks are older and sediment is thicker as you move away from the ridge This also explains the magnetic stripes found in the sea floor ...
Continental Drift Hypothesis - states that the continents had once
... Continental volcanic arcs – mountains formed by volcanic activity caused at the subduction of oceanic lithosphere beneath a continent. Volcanic island arcs - underwater mountains formed when volcanoes emerge from the sea as two oceanic slabs converge and one descends beneath the other. Paleomagneti ...
... Continental volcanic arcs – mountains formed by volcanic activity caused at the subduction of oceanic lithosphere beneath a continent. Volcanic island arcs - underwater mountains formed when volcanoes emerge from the sea as two oceanic slabs converge and one descends beneath the other. Paleomagneti ...
1.4 Powerpoint
... – Find rocks shaped like pillows. This rock shows that molten material has erupted again and again along the mid-ocean ridge ...
... – Find rocks shaped like pillows. This rock shows that molten material has erupted again and again along the mid-ocean ridge ...
Ch. 7 - Department of Physics and Astronomy
... Plates can also slide along each other, creating faults where many earthquakes occur: San Andreas Fault North American Plate ...
... Plates can also slide along each other, creating faults where many earthquakes occur: San Andreas Fault North American Plate ...
plate-tectonics-pre-test-study-guide
... ______ 12. Crust is neither destroyed nor formed by which of the following boundaries? a. convergent b. divergent c. transform d. magnetic ______ 13. The driving forces of tectonic plates are related to convection currents in Earth’s _____ a. crust b. mantle c. inner core d. outer core ______ 14. A ...
... ______ 12. Crust is neither destroyed nor formed by which of the following boundaries? a. convergent b. divergent c. transform d. magnetic ______ 13. The driving forces of tectonic plates are related to convection currents in Earth’s _____ a. crust b. mantle c. inner core d. outer core ______ 14. A ...
PLATE TECTONICS
... across the ocean. – The Appalachian Mountains extend northward along the eastern coast of North America, and mountains of similar age and structure are found in Greenland, Scotland, and northern Europe. – When reassembled into one continent, the mountains of similar age line up and fit together. ...
... across the ocean. – The Appalachian Mountains extend northward along the eastern coast of North America, and mountains of similar age and structure are found in Greenland, Scotland, and northern Europe. – When reassembled into one continent, the mountains of similar age line up and fit together. ...
Name
... 15. Explain the difference between magma and lava? Magma is a thick liquid in the mantle. When the magma reaches the earth’s surface (through a volcano), it becomes lava. 16. What percent of earth’s mass is the crust? Crust is the thinnest layer (less than 1%) 17. What is the lithosphere? What is it ...
... 15. Explain the difference between magma and lava? Magma is a thick liquid in the mantle. When the magma reaches the earth’s surface (through a volcano), it becomes lava. 16. What percent of earth’s mass is the crust? Crust is the thinnest layer (less than 1%) 17. What is the lithosphere? What is it ...
Geology 412-001: Crustal Geophysics Spring 2007
... search for geophysical data and interpretations and from this information construct a report on the crustal structure and evolution of the region, together with suggestions for future geophysical studies. 1st Iteration (8 points): Include gravity and magnetic data 2nd Iteration (16 points): Include ...
... search for geophysical data and interpretations and from this information construct a report on the crustal structure and evolution of the region, together with suggestions for future geophysical studies. 1st Iteration (8 points): Include gravity and magnetic data 2nd Iteration (16 points): Include ...
Sea-Floor Spreading
... Remember that the earth is like a giant magnet, and our compasses always point north. The earth’s magnetic poles have reversed themselves throughout history. The last time this happened was 780,00 years ago. Scientists discovered that the rock that makes up the ocean floors lies in a pattern o ...
... Remember that the earth is like a giant magnet, and our compasses always point north. The earth’s magnetic poles have reversed themselves throughout history. The last time this happened was 780,00 years ago. Scientists discovered that the rock that makes up the ocean floors lies in a pattern o ...
Dynamic Earth Grade: 8th Lesson: Advance Earth - Geo
... Motion of liquid iron and nickel in the outer core gives the Earth a dipole magnetic field, nearly aligned with the rotational axis. The magnetic field of the Earth reverses spontaneously at random times. Over the last several million years, the average time between reversals has been about 200,000 ...
... Motion of liquid iron and nickel in the outer core gives the Earth a dipole magnetic field, nearly aligned with the rotational axis. The magnetic field of the Earth reverses spontaneously at random times. Over the last several million years, the average time between reversals has been about 200,000 ...
Plate Tectonics - Mountain Home School District
... comparison of how oceanic and continental crust float in the mantle. Also, show how the crust floats differently in the mantle beneath a mountain range compared to a flat ...
... comparison of how oceanic and continental crust float in the mantle. Also, show how the crust floats differently in the mantle beneath a mountain range compared to a flat ...
Study questions for Quiz 8 Plate Tectonics – more questions on
... What were the major breakthroughs I the 1960s that helped to support the theory of Plate Tectonics? Where does most tectonic activity occur? What features on the Earth’s surface indicate the direction of relative motion of the crustal plates? What is the probable cause of the Earth’s internal convec ...
... What were the major breakthroughs I the 1960s that helped to support the theory of Plate Tectonics? Where does most tectonic activity occur? What features on the Earth’s surface indicate the direction of relative motion of the crustal plates? What is the probable cause of the Earth’s internal convec ...
Seafloor spreading
... crust that floats on a plastic mantle. Deep inside our planet there’s a very hot core. The Earth’s crust, which contains the continents and seafloor, is geologically divided into seven large and numerous small plates. The plates move, driven by the heat convection in the Earth’s mantle, at a speed o ...
... crust that floats on a plastic mantle. Deep inside our planet there’s a very hot core. The Earth’s crust, which contains the continents and seafloor, is geologically divided into seven large and numerous small plates. The plates move, driven by the heat convection in the Earth’s mantle, at a speed o ...
from continental drift to plate tectonics
... since the mid-century, but they had been made newly problematic by Darwin's theory of evolution. If plants and animals had evolved independently in different places within diverse environments, then why did they look so similar? Suess explained this conundrum by attributing these similar species to ...
... since the mid-century, but they had been made newly problematic by Darwin's theory of evolution. If plants and animals had evolved independently in different places within diverse environments, then why did they look so similar? Suess explained this conundrum by attributing these similar species to ...
Chapter 3: Plate Tectonics
... supercontinent called Pangaea. • He thought the continents seemed to fit together as a puzzle. ...
... supercontinent called Pangaea. • He thought the continents seemed to fit together as a puzzle. ...
Slide 1
... grade in this class. • I can describe continental drift • BR: How do you think you did on the test yesterday? ...
... grade in this class. • I can describe continental drift • BR: How do you think you did on the test yesterday? ...
Slide 1
... • The Earth’s crust is broken up into plates which move around on top of the mantle **Driven by convection currents** ...
... • The Earth’s crust is broken up into plates which move around on top of the mantle **Driven by convection currents** ...
ON THE RELATION BETWEEN TELLURIC CURRENTS AND THE
... I) that that II did not believe that that they they With respect respect to transients, I stated (GEOPHYSICS, (GEOPHYSICS,XVIII, XVIII, p. 61 present great practical it would please please me if if you were to find practical interest. It It is is to be understood that that it a convenient and effect ...
... I) that that II did not believe that that they they With respect respect to transients, I stated (GEOPHYSICS, (GEOPHYSICS,XVIII, XVIII, p. 61 present great practical it would please please me if if you were to find practical interest. It It is is to be understood that that it a convenient and effect ...
Part A: Modeling Shadow Zones The structure of the Earth consists
... primarily of iron. At a hellish 5,700°C, this iron is as hot as the Sun’s surface, but the crushing pressure caused by gravity prevents it from becoming liquid. Surrounding this is the outer core, a 2,000 km thick layer of iron, nickel, and small quantities of other metals. Lower pressure than the i ...
... primarily of iron. At a hellish 5,700°C, this iron is as hot as the Sun’s surface, but the crushing pressure caused by gravity prevents it from becoming liquid. Surrounding this is the outer core, a 2,000 km thick layer of iron, nickel, and small quantities of other metals. Lower pressure than the i ...
Name - mrspilkington
... There is evidence to prove this theory. Scientists studied rocks from the ocean floor. Rocks closest to the ridge were younger than rocks found farther away. Magnetic mapping also helped to prove this theory. Scientists found identical magnetic stripes on both sides of the ridge. ...
... There is evidence to prove this theory. Scientists studied rocks from the ocean floor. Rocks closest to the ridge were younger than rocks found farther away. Magnetic mapping also helped to prove this theory. Scientists found identical magnetic stripes on both sides of the ridge. ...
KICKS Plate Tectonics
... Normal Polarity Earth’s current magnetic field.). The next band out showed reversed polarity, followed by a band of Reversed Polarity normal polarity and so on. Conclusions: • It is known that the magnetic polarity of the planet has gone through repeated reversals, although the mechanisms for this a ...
... Normal Polarity Earth’s current magnetic field.). The next band out showed reversed polarity, followed by a band of Reversed Polarity normal polarity and so on. Conclusions: • It is known that the magnetic polarity of the planet has gone through repeated reversals, although the mechanisms for this a ...
Seismic Waves
... • move out from the earthquake focus • move slower than primary waves • move through solid rock only • move at right angles to primary waves causing rocks to move up & down & side to side ...
... • move out from the earthquake focus • move slower than primary waves • move through solid rock only • move at right angles to primary waves causing rocks to move up & down & side to side ...
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.