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How is magnetic evidence preserved in the rocks that form along an ocean ridge?
Wiki User
∙ 11y ago
Iron minerals that are present in magma or lava along the ridge that has not completely crystallized into rock are aligned with the Earth's polarity. When the magma or lava cools and solidifies completely, the magnetic orientation of the Earth at that time is preserved in the body of igneous rock.
Wiki User
∙ 11y ago
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Strips of alternating magnetic polarities found in rocks in the ocean basin?
provide evidence for sea-floor spreading
How do rocks along the central valley of the mid ocean ridge provide evidence for sea floor spreading?
because the scientists found that the farther the rocks the older the rocks were. so the youngest rocks were found near the mid-ocean ridge. this showed that sea-floor spreading took place. +++ The primary evidence is "magnetic striping": remnant magnetising by the Earth's magnetic field of the iron compounds in the basalt forming the ocean floor. The magnetic traces are parallel to the spreading-ridges, and their polarity reflect the field's periodic reversal. The further from the ridge, the older the stripes. The rock is imprinted with the magnetism as it cools below a certain point in being eruped along the ridge.
How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading?
Strips of ocean-floor basalt record the polarity of earth's magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge. the pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.
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.
What are three kinds of evidence scientists have discovered to support the idea of the ocean floor spreading?
molten material, magnetic stripes, and the ages of the rock.
How do rocks along the central valley of the mid-ocean ridge provide evidence of the sea-floor spreading?
Magnetic field direction.
How do earths magnetic pole reversals provide evidence for plate tectonics?
Magnetic stripes can be seen as you move away from ocean ridges.
What is sea floor spreading and what evidence do we have to prove it is happening?
Magnetic minerals on the ocean floor.
What is evidence that our planet has plates tectonics?
Chains of volcanos along ocean Coastlines
Strips of alternating magnetic polarities found in rocks in the ocean basin?
provide evidence for sea-floor spreading
Strips of alternating magnetic polarities found in rocks in the ocean basins?
provide evidence for sea-floor spreading
How do earths magnetic pole reversals provide evidence for tectonics?
rocks get older as you move away from ocean ridges
Strips of alternating magnetic polarities found in rocks in the ocean basins .?
provide evidence for sea-floor spreading
How do rocks along the central valley of the mid ocean ridge provide evidence for sea floor spreading?
because the scientists found that the farther the rocks the older the rocks were. so the youngest rocks were found near the mid-ocean ridge. this showed that sea-floor spreading took place. +++ The primary evidence is "magnetic striping": remnant magnetising by the Earth's magnetic field of the iron compounds in the basalt forming the ocean floor. The magnetic traces are parallel to the spreading-ridges, and their polarity reflect the field's periodic reversal. The further from the ridge, the older the stripes. The rock is imprinted with the magnetism as it cools below a certain point in being eruped along the ridge.
How do strip of magnetized rock on the ocean floor provide evidence of sea-floor spreading?
Strips of ocean-floor basalt record the polarity of earth's magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge. the pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.
How do strips of magnetized rock on the ocean floor provide evidence of sea-floor spreading?
Strips of ocean-floor basalt record the polarity of earth's magnetic field at the time the rock formed. These strips form a pattern that is the same on both sides of the mid-ocean ridge. the pattern shows that ocean floor forms along mid-ocean ridges and then moves away from the ridge.
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.
