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Used as evidence for sea-floor spreading?
Magnetic striping on the ocean floor is used as evidence for seafloor spreading. As new oceanic crust forms at mid-ocean ridges, Earth's magnetic field is recorded in the rocks in alternating patterns of normal and reversed polarity. This provides support for the idea that new crust is continuously being created at mid-ocean ridges and spreading away in opposite directions.
What concepts did magnetic striping reveal to scientists about the rock on either side of a spreading ridge?
The pattern of magnetic striping on one side of the ridge was a mirror image of the striping on the other side of the ridge, indicating that the plates were moving equally in opposite directions, giving a plausible explanation for continental drift theory. Before this discovery, no evidence of a mechanism for plate tectonics existed. It was obvious after this discovery, that new crust was being created at the ridges.
How do magnetic reversals provide evidence for sea-floor spreading?
The presence of magnetic domains of alternating orientation parallel to the plate boundaries.
What are the three lines of evidence for Plate Tectonics?
The three lines of evidence for Plate Tectonics are: 1) the distribution of earthquakes and volcanoes along plate boundaries, 2) the matching shapes of continents on opposite sides of the Atlantic Ocean, known as continental drift, and 3) the patterns of magnetic striping on the ocean floor that provide evidence of seafloor spreading.
Where is evidence found for sea-floor spreading?
Other than abundant matching fossils and sedimentary rock on opposite sides of the Atlantic Ocean and the apparent puzzle piece appearance of the continents on either side of the Atlantic, there is the presence of the mid-oceanic ridges, areas where new oceanic crust is created. The magnetic orientation of the basaltic oceanic crust as it forms is the mirror image of the magnetic orientation of the basaltic oceanic crust on the other side of the ridge, indicating that the seafloor is spreading in both directions away from ridge. Additionally, the dating of rock on the ocean floor has shown that oceanic crust and overlying sediment become progressively younger as the mid-ocean ridge is approached.And finally, accurate measurements have been made by global positioning devices which verify that seafloor spreading is occurring.
True or false Bands of magnetic material in the sea floor that have opposite poles or exhibit magnetic reversal can provide evidence for sea floor spreading.?
true
Used as evidence for sea-floor spreading?
Magnetic striping on the ocean floor is used as evidence for seafloor spreading. As new oceanic crust forms at mid-ocean ridges, Earth's magnetic field is recorded in the rocks in alternating patterns of normal and reversed polarity. This provides support for the idea that new crust is continuously being created at mid-ocean ridges and spreading away in opposite directions.
Volcanic rock shows that some layers have magnetic fields that are aligned opposite to Earths This evidence BEST fits which hypothesis?
The evidence of volcanic rock layers with opposite magnetic fields to Earth's aligns with the hypothesis of geomagnetic reversal. This suggests that Earth's magnetic field has flipped polarity multiple times throughout its history.
How can a magnetic field can be created?
By degaussing. Degaussing is a process of reducing the magnetism of a material by applying an opposite magnetic field.
What is the opposite of magnetic attraction?
The opposite of magnetic attraction is magnetic repulsion.
How did the new evidence support Hess's theory of seafloor spreading?
The new evidence provided observations of magnetic anomalies on the seafloor that were consistent with the pattern predicted by Hess's theory of seafloor spreading. These anomalies demonstrated symmetrical stripes of magnetic polarity on either side of mid-ocean ridges, supporting the idea that new oceanic crust was forming at these ridges and moving away in opposite directions.
What is one piece of evidence that supports sea floor spreading?
Mapping of magnetic anomalies on the ocean floor shows alternating bands of normal and reversed polarity, indicating that new oceanic crust is continuously forming at mid-ocean ridges and spreading away in opposite directions.
What do the strips of rocks with their magnetic poles pointing in the opposite direction to Earth and magnetic poles represent on the ocean floor?
The strips of rocks with their magnetic poles pointing in the opposite direction to Earth's magnetic poles represent the phenomenon of magnetic reversal, which occurs when Earth's magnetic field changes direction. These alternating stripes are found on the ocean floor, particularly at mid-ocean ridges, and are evidence of seafloor spreading. As magma rises and cools at these ridges, it records the Earth's magnetic field at that time, creating a pattern of magnetic anomalies that reflects the history of geomagnetic reversals. This pattern helps scientists understand the age of the oceanic crust and the processes of plate tectonics.
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.
Which is opposite word of magnetic?
Repellent or repulsive. Those words are opposites of magnetic.
How can you deactivate a magnet?
To deactivate a magnet, you can expose it to high temperatures or strong magnetic fields in the opposite direction to its current polarity. This can disrupt the alignment of the magnetic domains within the material, reducing or eliminating its magnetic properties.
What concepts did magnetic striping reveal to scientists about the rock on either side of a spreading ridge?
The pattern of magnetic striping on one side of the ridge was a mirror image of the striping on the other side of the ridge, indicating that the plates were moving equally in opposite directions, giving a plausible explanation for continental drift theory. Before this discovery, no evidence of a mechanism for plate tectonics existed. It was obvious after this discovery, that new crust was being created at the ridges.
