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Magnetic stripes on the sea floor are caused by the alternating polarities of Earth's magnetic field. As magma rises and solidifies at mid-ocean ridges, it locks in the magnetic orientation of the Earth's field at that time. Over time, as the Earth's magnetic field reverses, these magnetic stripes are preserved, providing a record of past magnetic field variations.
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Bands of magnetic material in the sea floor that have opposite poles or exhibit magnetic reversal can provide evidence for sea floor spreading true or false?
True. Bands of magnetic material in the sea floor that have opposite poles or exhibit magnetic reversal provide evidence for sea floor spreading. This is because as new oceanic crust forms at mid-ocean ridges, Earth's magnetic field periodically reverses, creating magnetic stripes on the ocean floor that align with the direction of the magnetic field at that time.
Describe how the polarity of earth's magnetic field is recorded in the sea-floor?
Magnetic minerals in the Earth's crust align with the planet's magnetic field at the time of their formation. When new oceanic crust is created at mid-ocean ridges, these minerals record the direction of the Earth's magnetic field on the sea-floor. This creates alternating stripes of normal and reversed polarity as the sea-floor spreads.
Strips of alternating magnetic polarities found in rocks in the ocean basins?
They are known as magnetic stripes and are formed as new sea floor is created at mid-ocean ridges. When molten rock solidifies, it preserves the direction of Earth's magnetic field at that time, creating a record of magnetic reversals in the oceanic crust. The alternating stripes of normal and reversed polarity provide evidence for seafloor spreading and plate tectonics.
What three types of evidence provided support for the theory of sea-floor spreading?
The discovery of mid-ocean ridges, where new oceanic crust is formed, supported the theory of sea-floor spreading. The mapping of magnetic stripes on the ocean floor, showing alternating patterns of magnetic polarity, provided further evidence for sea-floor spreading. The age of the oceanic crust getting progressively younger away from the mid-ocean ridges supported the concept of sea-floor spreading.
How do you Calculation the rate of sea floor spreading examples?
The rate of sea floor spreading is calculated by measuring the distance between magnetic stripes on the sea floor, which are formed by the alternating polarity of Earth's magnetic field. By knowing the age of the sea floor rocks at different distances from a mid-ocean ridge, scientists can determine the spreading rate. For example, if the rocks at a certain distance from the ridge are 1 million years old, and the distance is 100 km, the spreading rate would be 10 cm/year.
How magnetic reversals provide evidence for sea floor spreading?
Because of the stripes at the sea floor which are magnetic minerals
How does magnetic reversals provide evidence for seafloor spreading?
Because of the stripes at the sea floor which are magnetic minerals
What are magnetic strips on the sea floor caused by?
Movement of the ocean crust
Why do magnetic strips appear on the sea floor?
Magnetic stripes on the sea floor form as a result of the movement of tectonic plates. When magma rises to the surface at mid-ocean ridges and solidifies into new rock, it records the Earth's magnetic field at the time. This creates alternating stripes of normal and reversed polarity as the Earth's magnetic field has flipped multiple times throughout history.
Bands of magnetic material in the sea floor that have opposite poles or exhibit magnetic reversal can provide evidence for sea floor spreading true or false?
True. Bands of magnetic material in the sea floor that have opposite poles or exhibit magnetic reversal provide evidence for sea floor spreading. This is because as new oceanic crust forms at mid-ocean ridges, Earth's magnetic field periodically reverses, creating magnetic stripes on the ocean floor that align with the direction of the magnetic field at that time.
What three forms of evidence do geologists have of sea floor spreading?
Magnetic Stripes, Drilling Samples, and Molten Material.
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.
Describe how the polarity of earth's magnetic field is recorded in the sea-floor?
Magnetic minerals in the Earth's crust align with the planet's magnetic field at the time of their formation. When new oceanic crust is created at mid-ocean ridges, these minerals record the direction of the Earth's magnetic field on the sea-floor. This creates alternating stripes of normal and reversed polarity as the sea-floor spreads.
What three types of evidence provided support of the theory of sea-floor spreading?
three are : eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves :)
What three types of evidence provided support of the theory of sea floor spreading?
three are : eruptions of molten material magnetic stripes in the rock of the ocean floor and the ages of the rocks themselves :)
Strips of alternating magnetic polarities found in rocks in the ocean basins?
They are known as magnetic stripes and are formed as new sea floor is created at mid-ocean ridges. When molten rock solidifies, it preserves the direction of Earth's magnetic field at that time, creating a record of magnetic reversals in the oceanic crust. The alternating stripes of normal and reversed polarity provide evidence for seafloor spreading and plate tectonics.
What three types of evidence provided support for the theory of sea-floor spreading?
The discovery of mid-ocean ridges, where new oceanic crust is formed, supported the theory of sea-floor spreading. The mapping of magnetic stripes on the ocean floor, showing alternating patterns of magnetic polarity, provided further evidence for sea-floor spreading. The age of the oceanic crust getting progressively younger away from the mid-ocean ridges supported the concept of sea-floor spreading.
