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"Describe how the rate of sea-floor spreading may be calculated. Evaluate the
accuracy you any methods you describe." (25 marks)

First of all a by paleomagnitism via the identification of
magnetic anomalies it is possible to calculate the rate of
sea floor spreading. This works because about every
50,000 years…

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Figure 3: ages of sea floor rocks

Measure the distance between the centre of the spreading centre (red) and the border
between dark yellow and light green (65 Ma point)
Since the scale on the map is 1 cm = 475 km, calculate the real distance that the plate has…


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