Which one of the following is the evidence of seafloor spreading ?
Palaeomagnetism (Magnetic Anomalies)
The seafloor spreading hypothesis (Harry Hess, early 1960s) states that new oceanic crust forms at mid-oceanic ridges and moves away on both sides.
When lava cools at the ridge, iron-rich minerals lock in the direction of the Earth's magnetic field of that time. As the field reverses polarity over geological time, the new crust records alternating normal and reversed bands.
Vine and Matthews (1963) showed that these magnetic anomaly stripes run parallel to the ridge and are symmetrical on both sides, and their ages increase away from the ridge. This pattern can only arise if the floor is being created at the ridge and pushed outward, so palaeomagnetism is the decisive evidence.
Upwelling of magma at the ridges is the proposed mechanism of spreading, not proof of it, while drifting of continents and movement of plates are the wider ideas that seafloor spreading itself helps to explain.
Hence, Palaeomagnetism (Magnetic Anomalies).
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.................... is a client server application that identifies each host on the internet with a unique user-friendly name.
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