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Which information is needed to construct a geomagnetic time scale select the two correct answers the magnetic direction of rocks along the Earth the surface or the surface of Earth the length of the mid oceanic ridge the age of rocks along with the surface of the Earth the average speed of tectonic plates on Earth

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To construct a geomagnetic time scale, the two correct answers are:

  1. The magnetic direction of rocks along the surface of the Earth - This information is crucial as it records the Earth's past magnetic field orientations (paleomagnetism) at the time the rocks were formed.

  2. The age of rocks along the surface of the Earth - Knowing the age of the rocks helps to correlate changes in magnetic direction with specific time periods, allowing for the construction of a timeline.

These two pieces of information help in understanding the geomagnetic reversals and building a chronology of Earth's magnetic history.