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Strips of alternating magnetic polarities found in rocks in the ocean basin?
provide evidence for sea-floor spreading
Why are magnet patterns important evidence for plate tectonics?
magnetic rocks on the ocean floor show that the Earths magnetic field has been frequently reversed forming new sea floor.
How are magnetic patterns in sea floor rock evidence of seafloor spreading?
Magnetic alignment of rocks, in alternating strips that run parallel to ridges, indicates reversals in Earth's magnetic field and provides further evidence of seafloor spreading.
The patterns of iron particles found in sea floor rocks result from what?
The patterns of iron particles found in sea floor rocks result from changes in the Earth's magnetic field over time. As the molten rock solidifies into rock, the iron particles align with the Earth's magnetic field at that time, creating unique patterns that can be used to study the history of the Earth's magnetic field and plate tectonics.
How do rocks along the central valley of the mid-ocean ridge provide evidence of sea- floor spreading?
Rocks along the central valley of the mid-ocean ridge display symmetrical patterns of magnetic striping where new oceanic crust is formed. This occurs as magma is extruded along the ridge, creating a record of Earth's changing magnetic field over time. The alternating magnetic polarity of these rocks provides concrete evidence for sea-floor spreading and the movement of tectonic plates.
Identify how magnetic symmetry can be used as evidence of sea floor spreading?
As the sea floor spreads the magnetic orientation in the rocks as they cooled is preserved. As the earth's magnetic field changes then a distinct pattern is imprinted in the rocks. If sea floor spreading is true then this unique pattern should be the same on both sides from the spreading point. Measurements of sea bottom rocks verify this symmetry is true. :)
How is the polarity of Earth's magnetic field recorded in the sea floor?
The polarity of the Earth's magnetic field is recorded in igneous rocks, and reversals.
How do scientist date seafloor rocks?
Scientists date sea-floor rocks by looking at patterns in the rocks, including magnetic patterns, and by looking at the geomagnetic reversal time scale.
Magnetic striping of evidence of?
Magnetic reversals and sea floor spreading.
Why do magnetic stripes appear on the sea?
The seafloor spreads apart, creating new rocks that record magnetic orientation. Small grains of magnetite on the volcanic basalt (ocean floor) have magnetic properties.
Strips of alternating magnetic polarities found in rocks in the ocean basin?
provide evidence for sea-floor spreading
What are types of evidence that the sea floor is expanding?
Rocks have a north and south pole. The sea floor was discovered to have different magnetic poles on cracks in the ocean floor.
How were the reversals of the Earth's magnetic field discovered?
Reversals of the Earth's magnetic field were first discovered through studies of magnetized minerals in rocks that record the orientation of the ancient magnetic field. By examining these rocks, scientists found patterns of magnetic stripes on the ocean floor that indicated periods of magnetic field reversals over Earth's history. These findings were further supported by evidence from deep-sea sediment cores and volcanic rocks.
How do rocks along the central valley of the mid-ocean ridge provide evidence of the sea-floor spreading?
Rocks along the central valley of the mid-ocean ridge show a pattern of alternating polarity, indicating reversals in Earth's magnetic field. This pattern is caused by the cooling of magma at the ridge, locking in the magnetic orientation at the time of solidification. By studying the magnetic properties of these rocks, scientists can determine the rate of sea-floor spreading and the age of the oceanic crust.
Why are magnet patterns important evidence for plate tectonics?
magnetic rocks on the ocean floor show that the Earths magnetic field has been frequently reversed forming new sea floor.
How are magnetic patterns in sea floor rock evidence of seafloor spreading?
Magnetic alignment of rocks, in alternating strips that run parallel to ridges, indicates reversals in Earth's magnetic field and provides further evidence of seafloor spreading.
The patterns of iron particles found in sea floor rocks result from what?
The patterns of iron particles found in sea floor rocks result from changes in the Earth's magnetic field over time. As the molten rock solidifies into rock, the iron particles align with the Earth's magnetic field at that time, creating unique patterns that can be used to study the history of the Earth's magnetic field and plate tectonics.
