What does the magnetic evidence prove?

What does the magnetic evidence prove?

The magnetic evidence shows that the oldest rocks are far away from the ridge and the newest rocks are closest. This is powerful evidence that seafloor spreading does in fact occur.

Is magnetic striping evidence of continental drift?

Continental Drift – Seafloor Spreading – Plate Tectonics In 1912, Wegener formulated the theory of continental drift. The ultimate proof of this was the discovery of “magnetic stripes” on the seafloor later in the 1960s: the magnetic domains in oceanic rocks recorded reversal of Earth’s magnetic field over time.

What is magnetic striping?

Magnetic Striping is when the sea floor is spreading, and magma from the mantle is rising through the Earth’s crust. That magma then turns into new crust, forming the “Oceanic Crust”.

What causes magnetic striping?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. As it cools it becomes permanently magnetized in the direction of the Earth’s magnetic field. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

How is magnetic striping used as evidence for crust movement?

Therefore magnetic striping on the ocean floor provides evidence that the sea floor is spreading away from the mid-ocean ridges and explains how the continents move. New oceanic crust is formed when basalt erupts along the ridges, and existing crust is forced away from the ridge, causing sea floor spreading.

How does magnetic striping of rocks on the seafloor provide evidence for seafloor spreading?

When lava gets erupted at the mid-ocean ridge axis it cools and turns into hard rock. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges. These patterns of stripes provide the history of seafloor spreading.

Why is magnetic striping evidence seafloor spreading?

How is magnetic orientation evidence of plate tectonics?

One of the key pieces of evidence supporting plate tectonic theory was the discovery that rocks on the seafloor record ancient reversals of the Earth’s magnetic field: as rocks are formed where plates are moving away from one another, they record the current direction of the Earth’s magnetic field, which flip-flops …

Where is magnetic striping found?

At the mid-ocean ridge spreading axis, these flips in the direction of the Earth’s magnetic field are recorded in the magnetization of the lava. This creates a symmetrical pattern of magnetic stripes of opposite polarity on either side of mid-ocean ridges.

Which is evidence that supports the dynamo theory?

The correct answer is: Earth’s core contains mostly iron and nickel. Question: Which is evidence that supports the dynamo theory? A. Granite and basalt conduct electricity.

What evidence was found by geophysicists about magnetic patterns found on the ocean floor?

Oceanographic exploration in the 1950s led to a much better understanding of the ocean floor. Among the new findings was the discovery of zebra stripe-like magnetic patterns for the rocks of the ocean floor. These patterns were unlike any seen for continental rocks.

What is evidence that supports the dynamo theory?

The correct answer is option B) Earth’s core contains a large amount of iron. The dynamo theory explains how celestial bodies develop magnetic fields. According to the theory, the magnetic field is generated by the motion of a rotating and electrically conducting fluid.

How are the magnetic stripes evidence of sea-floor spreading?

4. Magnetic stripes. In the 20th century, the magnetic survey was conducted in the Mid-ocean ridge in order to investigate evidence of sea-floor spreading. By using the magnetometer , the magnetic polarity will be shown through a timescale that contains the normal and a reverse polarity .

What is the evidence of magnetic reversal?

Magnetic reversals C. PROVIDE STRONG EVIDENCE FOR SEAFLOOR SPREADING . Magnetic reversal is evident when the change in the Earth’s magnetic field results in the magnetic north being aligned with the geographic south, and the magnetic south being aligned with the geographic north.

What is a magnetic strip?

magnetic strip. noun. a strip of magnetic material on which information may be stored, as by an electromagnetic process, for automatic reading, decoding, or recognition by a device that detects magnetic variations on the strip: a credit card with a magnetic strip to prevent counterfeiting.

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