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With respect to the Mid-Atlantic Ridge, what provides evidence of seafloor spreading?

The magnetic bands preserved in the Atlantic oceanic plate are:

A. Oblique
B. Perpendicular
C. Asymmetric
D. Symmetric

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What is the Wadati-Benioff zone?

A. A zone of metamorphism that defines a subduction zone.
B. A zone of thickened continental crust above a subduction zone.
C. A zone of earthquake foci that define a divergent plate margin.

Answer :

The magnetic bands preserved in the Atlantic oceanic plate are symmetric. These bands are a key piece of evidence supporting the theory of seafloor spreading.

The symmetrical pattern of magnetic anomalies on either side of the mid-Atlantic ridge indicates that new oceanic crust is continually forming at the ridge and moving away in opposite directions. As the Earth's magnetic field periodically reverses polarity, the magnetic minerals in the cooling lava preserve these reversals, creating a symmetrical pattern of magnetic bands along the seafloor.

The Wadati-Benioff zone is a zone of earthquake foci that define a subduction zone. This zone is characterized by a dipping plane of earthquakes that occur as one tectonic plate subducts beneath another. The Wadati-Benioff zone is named after the seismologists Hugo Benioff and Kiyoo Wadati, who independently observed this pattern of earthquakes.

These earthquakes indicate the downward movement of one tectonic plate into the mantle, marking the presence of a subduction zone. The Wadati-Benioff zone provides valuable information about the location and behavior of subduction zones, which are important features in plate tectonics and the formation of volcanic arcs.

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