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What happens to the magnetic orientation of rocks as the pole reverse?
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∙ 6y ago
There is nothing -_-
Michelle Littel
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How is the orientation of earths magnetism recorded in rocks on the?
Earth's magnetic orientation is locked into the rock when the rock cools
Why do magnetic stripes appear on the seefloor?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
Studying the magnetic patterns of the rocks in the floor of the ocean helps scientists do what?
It helps them determine the frequency of shifts in the magnetic orientation of the Earth, and initially led to the confirmation of seafloor spreading at the mid-ocean ridges.
How does magnetic reversals found in the sea floor rocks cause continental drift?
Magnetic reversals found in the sea floor do not cause continental drift. It does however provide evidence that sea floor spreading occurs (and hence is evidence for the theory of plate tectonics). This is because the iron rich minerals in basaltic rocks (such as magnetite) are at high temperatures when they are first intruded into the crust and at these high temperatures they record the orientation of Earth's magnetic field. As they cool, this record of the orientation of the magnetic field is "locked" in place. The Earth's magnetic field is known to "reverse polarity" - the north and south magnetic poles switch over time and so the orientation of the magnetic field in newly cooled rocks will change to match this. Geophysicists had recognised that there were alternating bands of rocks with these reversed orientations of the magnetic field. These bands ran parallel to the Mid-Ocean-Ridges. In the 1960s after significant magnetic survey work was undertaken it was realised that the alternating bands on one side of the oceanic ridge were a mirror image to the bands on the other side. So why is this evidence for sea floor spreading / plate tectonics? Well it was realised that if the newly intruded rock was to move away from the Mid-Ocean-Ridge (M-O-R) and be replaced with new younger rock, this rock would continue to record the orientation of the Earth's magnetic field as and when reversals occurred. As such this would lead to the stripes of alternating magnetic orientation that are symmetrical about the M-O-R. As such movement of the plates away from a M-O-R and the reversals of Earth's magnetic field best explained the presence of these bands and so confirmed the idea that sea floor spreading was occurring. For more information, please see the related link.
Is there evidence that sea floor spreading really happens?
The evidence exists in the extrusive igneous rock, basalt, on the ocean floor near the mid-oceanic ridges. The magnetic orientation of the Earth is recorded in the igneous rock at the time of its formation. The orientation of Earth's magnetic field changes over time, and thus provides a way to relatively date rocks. These orientations can be recorded and mapped with the aid of a magnetometer. Magnetic orientation of oceanic crustal rocks on one side of the mid-oceanic ridge appear as mirror images to the magnetic orientation of oceanic crustal rocks on the other side, meaning that the seafloor is spreading in opposite directions from the rift zone over time. Modern instruments have measured the movement of crust away from the rift zone and it roughly approximates the rate of human fingernail growth.
What happens to the magnetic orientation of rocks as the poles reverse?
There is nothing -_-
What happen to the magnetic orientation of rocks as the poles reverse?
There is nothing -_-
What happens to the magnetic orientation of rocks as the poles?
There is nothing -_-
The orientation of a rock’s magnetic field can tell you its?
The orientation of a rocks magnetic field can tell you it's relative age.
How can the magnetic orientation of rocks be used to trace a continent that has drifted?
When rocks are formed, usually from lava flows, the magnetic orientation of them is set as they solidify. As these rocks are affected by continental drift and other factors such as earthquakes, the original magnetic orientation remains. Using the known strengths of the earth's magnetic field over time, it is possible to then tell where these rocks originally emerged.
What can the orientation of a rocks magnetic field can tell you?
The orientation of a rocks magnetic field can tell you it's relative age.
What happened to the magnetic orientation of rocks as the poles reversed?
There is nothing -_-
How is the orientation of earths magnetism recorded in rocks on the?
Earth's magnetic orientation is locked into the rock when the rock cools
How can the magnetic orientation of rocks be used to trace the way a continent moved as it drifted?
•The magnetic orientation of rocks of different ages can be compared to get an idea of how the position of a continent has changed over time. This is the exact answer out of the book.
How is the orientation of Earth's magnetism recorded in rocks on the ocean floor?
Earths magnetic orientation is locked into the rock when the rock cools
How is the orientation of earths magnetics recorded in the rocks on the ocean?
Earths magnetic orientation is locked into the rock when the rock cools
What happens to rocks along a fault line?
reverse fault
