Question

How can earth’s magnetic reversal be used to support Seafloor spreading theory?
What are the lines of evidence that support the plate movement?

Answer 1

Answer:

seafloor spreading and magnetic striping

Rising magma assumes the polarity of Earth's geomagnetic field before it solidifies into oceanic crust. At spreading centres, this crust is separated into parallel bands of rock by successive waves of emergent magma. When Earth's geomagnetic field undergoes a reversal, the change in polarity is recorded in the magma, which contributes to the alternating pattern of magnetic striping on the seafloor.

Explanation:

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Answer 2

The geologic process of seafloor spreading occurs when tectonic plates—large slabs of Earth's earth's crust apart from one another. The effect of mantle convection is seafloor expansion and other seismic activity processes. Divergent plate boundaries cause seafloor spreading.

Explanation:

• A mid-ocean ridge stretches over the seafloor. The rocks that are farther away are older, whereas the rocks that are closer to the ridge are fresher.
• Some of the molecules in the magma from the ridge arrange themselves with the magnetic field as it cools.
• When the field shifts, the polarity of the rocks shifts as well.
• We can establish how long magnetic reversals lasted by reading the width of bands of differently polarized rock and understanding the rate at which they spread.
• The seafloor spreading idea has been backed up by research into oceanic magnetic anomalies.
• With increasing distance away from the axis of the mid-ocean ridge system, such studies have revealed that the geomagnetic field strength alternates between anomalously strong and low.
• The abnormal features are organized roughly symmetrically on both sides of the axis and run parallel to it, forming bands of parallel irregularities.
• A fresh stripe with the new polarity begins as the Earth's magnetic field reverses.
• The discovery of such magnetic patterns led to the discovery of sea-floor spreading, and they remain some of the most compelling evidence for plate tectonics theory.

Evidence that supports up the movement of the plates:

• Fossils, glaciers, and complementary coasts provide evidence of how the plates used to fit together.
• Plant and animal fossils tell us when and where they lived. Some forms of life "rode" on divergent plates, becoming separated and evolving into new species.
• Pangaea can be reconstructed using the edges of continents.
• Aside from the continents' margins fitting together, the presence of evidence from the same continents helped with the reconstruction.
• It was deduced that plate movement has been going on for a long time, and that it is the cause of many geological occurrences such as volcanic eruptions, mountain ranges, and so on.