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The earths magnetic polarity at the time of rock formation.
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magnetic rocks on the ocean floor show that the Earths magnetic field has been frequently reversed forming new sea floor.
sea-floor spreading
sea-floor spreading is caused by deep-ocean trenches that overflows and makes a new layer come out. heres a video if you would like to watch it.science.discovery.com/videos/...shorts-sea-floor-spreading.html
looking at patterns
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By using a siesmograph.
Convection currents
Subduction and sea floor spreading are both a result of the movement of the tectonic plates.Plate Tectonics
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Ridges, parallel to the axis of spreading, are formed in the ocean floor as hot lava moves up to fill the gap then cools when it comes in contact with sea water.
Scientists date sea-floor rocks by looking at patterns in the rocks, including magnetic patterns, and by looking at the geomagnetic reversal time scale.
The earths magnetic polarity at the time of rock formation.
i have no idea ill find out
Subduction and sea floor spreading are both a result of the movement of the tectonic plates.Plate Tectonics
magnetic rocks on the ocean floor show that the Earths magnetic field has been frequently reversed forming new sea floor.