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Exp 05 Sea Floor Spreading
... needle in a compass. When the rock solidifies, this magnetic “signature” is locked in place. Throughout history, the orientation of the Earth’s magnetic field has varied greatly. At times, the magnetic pole in the north has reversed completely and was located near the south geographic pole. Because ...
... needle in a compass. When the rock solidifies, this magnetic “signature” is locked in place. Throughout history, the orientation of the Earth’s magnetic field has varied greatly. At times, the magnetic pole in the north has reversed completely and was located near the south geographic pole. Because ...
study guide for module #6
... 13. What makes the rapid decay theory more scientifically valid than the dynamo theory? 14. Why is a catastrophe like Noah’s Flood an essential part of earth’s history if the rapid decay theory is true? 15. What two reasons make otherwise good scientists ignore the more scientifically valid rapid de ...
... 13. What makes the rapid decay theory more scientifically valid than the dynamo theory? 14. Why is a catastrophe like Noah’s Flood an essential part of earth’s history if the rapid decay theory is true? 15. What two reasons make otherwise good scientists ignore the more scientifically valid rapid de ...
Physical Science - elyceum-beta
... orientation as the ship moves away from ridge • Evidence that the orientation reverses every 200,000 to several million years • Matched bands with the same magnetic orientation are found on both sides of a ridge ...
... orientation as the ship moves away from ridge • Evidence that the orientation reverses every 200,000 to several million years • Matched bands with the same magnetic orientation are found on both sides of a ridge ...
18.3 - Faculty Perry, Oklahoma
... transform boundary occurs where tectonic plates scrape past each other rift valley a gap formed between two diverging plates magnetic reversal when Earth’s magnetic north and south poles switch places hot spot an area of volcanic activity that develops above a plume in the mantle ...
... transform boundary occurs where tectonic plates scrape past each other rift valley a gap formed between two diverging plates magnetic reversal when Earth’s magnetic north and south poles switch places hot spot an area of volcanic activity that develops above a plume in the mantle ...
Plate Tectonics II
... • 1940’s - geologists discover that the Earth’s magnetic field is recorded by iron-bearing minerals during the formation of rocks. • Remnant magnetism is trapped in the rock. • Magnetic minerals act like tiny compasses, pointing to the former position of the magnetic pole (declination). • Magnetic m ...
... • 1940’s - geologists discover that the Earth’s magnetic field is recorded by iron-bearing minerals during the formation of rocks. • Remnant magnetism is trapped in the rock. • Magnetic minerals act like tiny compasses, pointing to the former position of the magnetic pole (declination). • Magnetic m ...
Slide 1 - My Teacher Pages
... ridge forming new oceanic crust • Tectonic plates spread apart and magma fills the gap. • As new crust forms older crust moves away from the M.O.R. ...
... ridge forming new oceanic crust • Tectonic plates spread apart and magma fills the gap. • As new crust forms older crust moves away from the M.O.R. ...
4. Seafloor Spreading Notes
... • Earth’s magnetic field has reversed many times since its creation ...
... • Earth’s magnetic field has reversed many times since its creation ...
Plate Tectonics 1. Continental Drift
... -Ex. Appalachians and mountains in Scotland and Northern Europe 5) Climactic changes seen in geologic record -Pangea once positioned over South Pole forming glaciers in South Africa and South America -Coal deposits in North America (once covered by tropical or subtropical swamps) -Wegner didn’t know ...
... -Ex. Appalachians and mountains in Scotland and Northern Europe 5) Climactic changes seen in geologic record -Pangea once positioned over South Pole forming glaciers in South Africa and South America -Coal deposits in North America (once covered by tropical or subtropical swamps) -Wegner didn’t know ...
Magnetic stripes - Earth Learning Idea
... the south pole is today, and vice versa). Magnetise these, again using the North end of the bar magnet, and stroking towards the points of the pins. • Continue the activity for one or two more sets of pins and then pull out the whole card and lay it on the bench. • Ensure that the bar magnet is plac ...
... the south pole is today, and vice versa). Magnetise these, again using the North end of the bar magnet, and stroking towards the points of the pins. • Continue the activity for one or two more sets of pins and then pull out the whole card and lay it on the bench. • Ensure that the bar magnet is plac ...
Continental Drift - Monroe County Schools
... 1950’s More evidence is discovered: Magnetic strips & Polar reversals After World War II magnetometers that were used to find submarines began finding odd magnetic patterns across the ocean floor. The ocean floor is made up of Basalt, which is rich in magnetite. Basalt had already been found that h ...
... 1950’s More evidence is discovered: Magnetic strips & Polar reversals After World War II magnetometers that were used to find submarines began finding odd magnetic patterns across the ocean floor. The ocean floor is made up of Basalt, which is rich in magnetite. Basalt had already been found that h ...
Sea Floor Spreading NOTES 2016 Key
... 1. Starts at the __mid-ocean ridge___ 2. Molten material rises from the ___asthenosphere____ and erupts. 3. The molten material then ______spreads out_______ 4. Pushes ___older___ rock to both sides of the ridge. 5. The molten material ___cools___ 6. Forms a strip of solid rock in the center of the ...
... 1. Starts at the __mid-ocean ridge___ 2. Molten material rises from the ___asthenosphere____ and erupts. 3. The molten material then ______spreads out_______ 4. Pushes ___older___ rock to both sides of the ridge. 5. The molten material ___cools___ 6. Forms a strip of solid rock in the center of the ...
Magnets - OptionsHighSchool
... inner core is solid and is moving through space there might be "electric currents" that induce a magnetic field. ...
... inner core is solid and is moving through space there might be "electric currents" that induce a magnetic field. ...
Continental Drift, Mountain Building, and Plate Tectonics
... These fossil magnets reflect changes in the magnetic field through time. INCLINATION is the angle the magnetic makes with the earth’s surface = latitiude DECLINATION is the angle between the magnetic and geographic north pole Sea floor spreading shows a pattern of increasing age of the seafloor and ...
... These fossil magnets reflect changes in the magnetic field through time. INCLINATION is the angle the magnetic makes with the earth’s surface = latitiude DECLINATION is the angle between the magnetic and geographic north pole Sea floor spreading shows a pattern of increasing age of the seafloor and ...
Right Hand Rule Study Sheet
... A solenoid creates a magnetic field down its center. If a piece of iron is slipped into the solenoid it becomes a stronger electromagnet. This Right Hand Rule can be used to determine the polarity of an electromagnet. Right Hand Rule #3 A current-carrying wire experiences forces when placed in a mag ...
... A solenoid creates a magnetic field down its center. If a piece of iron is slipped into the solenoid it becomes a stronger electromagnet. This Right Hand Rule can be used to determine the polarity of an electromagnet. Right Hand Rule #3 A current-carrying wire experiences forces when placed in a mag ...
Attention Graduate Students Introduction to Plasma Physics Physics
... field line to its neighbor, staying roughly at the same distance. Typical time to circle the Earth--a few minutes. View from North Pole ...
... field line to its neighbor, staying roughly at the same distance. Typical time to circle the Earth--a few minutes. View from North Pole ...
Chapter 3 The Origin of Ocean Basins LEARNING OBJECTIVES 1
... 1. Understand the processes that are continuously changing Earth’s surface as lithospheric plates move relative to one another. 2. Identify the role of oceanic ridges, transform faults and deep-sea trenches in defining the edges of lithospheric plates. 3. Understand the importance of asthenospheric ...
... 1. Understand the processes that are continuously changing Earth’s surface as lithospheric plates move relative to one another. 2. Identify the role of oceanic ridges, transform faults and deep-sea trenches in defining the edges of lithospheric plates. 3. Understand the importance of asthenospheric ...
Physics 1 notes 4-11-13 NOVA earth`s magnetic field
... magnetic field at that time. It’s possible to plot a graph of the field strength over time. In the past 300 years, the field strength has declined. Scientists model the earth’s core with liquid sodium, which is highly conductive, like molten iron. Magnetic field generates electric current that g ...
... magnetic field at that time. It’s possible to plot a graph of the field strength over time. In the past 300 years, the field strength has declined. Scientists model the earth’s core with liquid sodium, which is highly conductive, like molten iron. Magnetic field generates electric current that g ...
Word
... A house has a floor area of 112 m² and an outside wall that has an area of 28 m². the earth’s magnetic field at that location has a horizontal component of 2.6 x 10-5 T, north, and a vertical component of 4.2 x 10-5 T, down. Determine the magnetic flux through the wall if the wall faces (a) north, a ...
... A house has a floor area of 112 m² and an outside wall that has an area of 28 m². the earth’s magnetic field at that location has a horizontal component of 2.6 x 10-5 T, north, and a vertical component of 4.2 x 10-5 T, down. Determine the magnetic flux through the wall if the wall faces (a) north, a ...
B. The sea floor spreads apart at divergent boundaries 1. Rift Valley
... magnetic poles are not in the same place. •Earth’s magnetic poles switch places every so often. North becomes South and the South becomes North ...
... magnetic poles are not in the same place. •Earth’s magnetic poles switch places every so often. North becomes South and the South becomes North ...
Continental Drift
... • Mapping of the ocean floor revealed a long mountain range running down the middle of the Atlantic Ocean. • It is called the “Mid- ...
... • Mapping of the ocean floor revealed a long mountain range running down the middle of the Atlantic Ocean. • It is called the “Mid- ...
Lecture #13 – magnetic reversals
... geologic past is obtained from what is called “remnant magnetism” contained in rocks. When a hot magma cools from >1000°C to form a solid rocks, tiny magnetic minerals -iron oxides -- in the rock line up like little bar magnets along the direction of the earth’s magnetic field and preserve informati ...
... geologic past is obtained from what is called “remnant magnetism” contained in rocks. When a hot magma cools from >1000°C to form a solid rocks, tiny magnetic minerals -iron oxides -- in the rock line up like little bar magnets along the direction of the earth’s magnetic field and preserve informati ...
Sea-Floor spreading
... Magnetic Stripes Alignment pattern of magnetic grains in the sea-floor crust that change over time based on the Polar direction (N v S) Every 100 K years the magnetic poles change direction (magnetic reversal) ...
... Magnetic Stripes Alignment pattern of magnetic grains in the sea-floor crust that change over time based on the Polar direction (N v S) Every 100 K years the magnetic poles change direction (magnetic reversal) ...
lecture notes
... o Variations in magnetic field (weaker or stronger) occur in the rocks are called magnetic anomalies o Magnetic anomalies can be measured with magnetometers o Magnetic anomalies and the types of rocks causing them form parallel bands arranged symmetrically about axis of ocean ridges o As basaltic ro ...
... o Variations in magnetic field (weaker or stronger) occur in the rocks are called magnetic anomalies o Magnetic anomalies can be measured with magnetometers o Magnetic anomalies and the types of rocks causing them form parallel bands arranged symmetrically about axis of ocean ridges o As basaltic ro ...
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.