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Is the pattern of magnetic stripes in rocks on either side of a mid-ocean ridge the same?
Wiki User
∙ 11y ago
its the same on either side of the mid-ocean ridge
Wiki User
∙ 12y ago
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What is used as evidence for sea-floor spreading-?
The rocks on either side of a mid-ocean ridge record the direction of the Earth's magnetic field at the time they were formed, and form a pattern of 'magnetic stripes' on either side of the ridge which are symmetrical. It is also now possible to measure ocean widths with sufficient accuracy to show yearly changes.
What are pole reversals?
The direction of the Earth's magnetic field has reversed several times during its history. This causes the North magnetic pole to become a South magnetic pole and vice versa. We know this because of the direction of magnetism in the rocks on the ocean floor, which alternates in 'stripes' on either side of the mid-ocean ridges.
How does the mid ocean ridge magnetic signal prove sea floor spreading?
New oceanic crust is being created at the mid-ocean rift zones, a global divergent plate boundary system where uprising magma fills in the spaces being created by the pulling apart of plates. Part of the newly forming crust follows the direction of one plate, and part of the newly forming crust follows the direction of the other plate; therefore, the age of the rock created from the magma has a mirror image on either side of the rift. As new oceanic crust is continuously being formed at the mid-ocean ridges by upwelling molten rock, the direction of Earth's magnetic field is recorded in the rock by the orientation of magnetic minerals, which align themselves in the direction of the magnetic field before the rock completely crystallizes. Earth's magnetic field is known to change its orientation with frequency on a geologic time scale, thus a pattern of stripes of magnetic orientation is formed which can be detected with a magnetometer. The discovery of magnetic stripes on the seafloor have allowed researchers to provide additional proof that new crust is being created, and that magnetic reversals have occurred and will occur in the future. They tell us that over the course of thousands of years, Earth's polarity will reverse itself. The stripes are the magnetic "footprint" of Earth's shifting magnetic field.
Why do magnetic strips appear on seafloor?
Magnetic strips appear on the seafloor because it spreads apart, forming new rocks that have a magnetic properties.
What is the evidence of pole reversal?
The evidence for Earth's magnetic pole reversals comes from the Geological record. If you look at the fossil polarity of a section of sea floor taken across and to either side of a mid oceanic ridge, there is a mirror pattern of stripes where the rocks have reversed polar directions. Similarly the poles of the Sun reverse every 11 years as the sun goes through a maxima and minima.
What is used as evidence for sea-floor spreading-?
The rocks on either side of a mid-ocean ridge record the direction of the Earth's magnetic field at the time they were formed, and form a pattern of 'magnetic stripes' on either side of the ridge which are symmetrical. It is also now possible to measure ocean widths with sufficient accuracy to show yearly changes.
What causes Magnetic stripes on the seafloor are caused by?
These "stripes" formed the pattern known as magnetic striping. ... They hypothesized that the magnetic striping was produced from the generation of magma at mid-ocean ridges during alternating periods of normal and reversed magnetism by the magnetic reversals of the Earth's magnetic field.
What are pole reversals?
The direction of the Earth's magnetic field has reversed several times during its history. This causes the North magnetic pole to become a South magnetic pole and vice versa. We know this because of the direction of magnetism in the rocks on the ocean floor, which alternates in 'stripes' on either side of the mid-ocean ridges.
When the two substances are put in the same container they do not attract each other. Why does this happen?
Either one or both of the substances are not magnetic.
How does the mid ocean ridge magnetic signal prove sea floor spreading?
New oceanic crust is being created at the mid-ocean rift zones, a global divergent plate boundary system where uprising magma fills in the spaces being created by the pulling apart of plates. Part of the newly forming crust follows the direction of one plate, and part of the newly forming crust follows the direction of the other plate; therefore, the age of the rock created from the magma has a mirror image on either side of the rift. As new oceanic crust is continuously being formed at the mid-ocean ridges by upwelling molten rock, the direction of Earth's magnetic field is recorded in the rock by the orientation of magnetic minerals, which align themselves in the direction of the magnetic field before the rock completely crystallizes. Earth's magnetic field is known to change its orientation with frequency on a geologic time scale, thus a pattern of stripes of magnetic orientation is formed which can be detected with a magnetometer. The discovery of magnetic stripes on the seafloor have allowed researchers to provide additional proof that new crust is being created, and that magnetic reversals have occurred and will occur in the future. They tell us that over the course of thousands of years, Earth's polarity will reverse itself. The stripes are the magnetic "footprint" of Earth's shifting magnetic field.
Why do magnetic strips appear on seafloor?
Magnetic strips appear on the seafloor because it spreads apart, forming new rocks that have a magnetic properties.
What is the pattern of magnetic polarity reversals?
In a geomagnetic reversal, the south and north magnetic poles flip locations. A magnetic pole reversal takes place every 450,000 years on average, but this is not regular. We are way overdue since the last reversal was 780,000 years ago. There is a pattern in the magnetic polarity of basaltic rocks on opposite sides of a mid-ocean ridge. Basalt contains tiny magnetic crystals that point to the location of the north magnetic pole at the time the lava cools. The rocks at the ridge have positive polarity, but on either side of the ridge the polarity is negative, indicating that those lavas cooled when the magnetic field was opposite of what it is today. On either side of the basalt with negative polarity are more rocks with positive polarity. This pattern continues on both sides of the mid-ocean ridge across the ocean basin. The pattern of magnetic polarity is one of the main lines of evidence for seafloor spreading, which is the mechanism for plate tectonics.
What is the evidence of pole reversal?
The evidence for Earth's magnetic pole reversals comes from the Geological record. If you look at the fossil polarity of a section of sea floor taken across and to either side of a mid oceanic ridge, there is a mirror pattern of stripes where the rocks have reversed polar directions. Similarly the poles of the Sun reverse every 11 years as the sun goes through a maxima and minima.
Is magnetic force?
Magnetic force is the force exerted between magnetic poles, producing magnetization of force, either of attraction or of repulsion.
Are diamonds magnetic?
no, diamonds are not magnetic as they are made from carbon which is not magnetic either.
Which observation about the mid atlantic ridge region probides the best evidence that the seafloor has been spreading for millions of years?
The fact that there is a series of magnetic 'stripes' on either side of the ridge. They show that the earth's magnetic field has reversed several times during the formation of the rocks, and this only happened about every 5 million years. (There is some evidence that this is speeding up).
Are recycled metals magnetic?
Depends on the metal, not on if it's recycled or not. If it's magnetic as virgin, it's magnetic as recycled - as iron. If it's NOT magnetic as virgin, it's NOT magnetic as recycled either - like copper.
