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That magnetic minerals spreading from a mid-ocean ridge
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What is shown by magnetic minerals spreading from a mid ocean ridge?
That magnetic minerals spreading from a mid-ocean ridge
What is shown by magnetic minerals spreading from mid ocean ridge?
That magnetic minerals spreading from a mid-ocean ridge
How do magnetic bands provide evidence that tectonic plates are moving apart at mid-oceanic ridges?
Through seafloor-spreading as iron rich minerals cool they become magnetized in the direction parallel to the existing magnetic field. As the magnetic fields change direction so will the magnetized minerals, allowing scientists to record each change in the seafloor as it spreads.
What is the relationship between the ages of magnetic stripes and their distance from the ridge crest?
Magnetic stripes that are closer to the ridge crest tend to be younger, while those further away are older. This is because new crust is continually formed at the ridge crest through sea floor spreading, with magnetic minerals aligning themselves with Earth's magnetic field as they solidify, creating the alternating pattern of magnetic striping.
What are the differences between ocean ridge and seamount?
The midocean ridges are the spreading centers where the plates are moving apart. The seamounts are extinct volcanos produced as the plate passed over a mantle hotspot.
First related the symmetrical magnetic patterns in seafloor basalts to seafloor spreading at a mid-ocean ridge?
Lawrence W. Morley, Frederick John Vine, and Drummond Hoyle Matthews were the first to tie magnetic stripe anomalies to seafloor spreading. The magnetic anomalies was the first evidence that supported the theory of seafloor spreading.
Which statement provides evidence that the seafloor is spreading out from both sides of the Mid-Atlantic Ridge?
The presence of alternating magnetic stripes on either side of the Mid-Atlantic Ridge provides evidence that the seafloor is spreading out. As magma solidifies to form new oceanic crust, it records the Earth's magnetic field. These magnetic stripes mirror each other on either side of the ridge, indicating a symmetric pattern of seafloor spreading.
When new rock is added to an oceanic ridge the magnetized strips on side of the ridge are evidence of sea floor spreading this is because the rock the two sides of the ridge?
are equal in width and polarity
Where do midocean ridges intersect the landmasses?
Midocean ridges are areas where continents broke apart. Midocean ridges are closest to the landmasses in younger oceans. One example where a midocean ridge intersected a landmass is the Arabian sea, which was formed by the pulling apart of the Arabian Peninsula and Africa.
Why are magnetic stripes on the seafood are parallel to the mid ocean ridge?
The magnetic stripes on the ocean floor, including those found in seafood areas, are parallel to the mid-ocean ridge due to the process of seafloor spreading. As magma rises at the mid-ocean ridge and solidifies, iron-rich minerals within the magma align with the Earth's magnetic field, creating symmetrical stripes of magnetic polarity on either side of the ridge. This phenomenon occurs over time as new crust is formed and pushes older crust away from the ridge, effectively recording the history of the Earth's magnetic field reversals. Thus, the parallel magnetic stripes are a direct result of the geological processes associated with the mid-ocean ridge.
How is paleomagnetism used to calculate the rate of seafloor spreading?
Paleomagnetism measures the orientation of magnetic minerals in rocks, which record the Earth's magnetic field direction at the time of their formation. In the context of seafloor spreading, scientists analyze the magnetic stripes on either side of mid-ocean ridges, where new oceanic crust is created. By dating these magnetic anomalies and measuring their distance from the ridge, researchers can calculate the rate at which the seafloor is spreading. This method provides insights into the dynamics of plate tectonics and the history of Earth's magnetic field reversals.
Why do bands indicating magnetic reversals appear to be of similar width on both sides of a mid-ocean ridge?
They appear to be similar in width because new crust formation is nearly equal on each side of the fault.
