Which information is needed to construct a geomagnetic time scale? Select the two correct

answers.
the magnetic direction of rocks along the surface of Earth
the age of rocks along the surface of Earth
the average speed of tectonic plates on Earth
D the length of the mid-oceanic ridge

1 answer

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

  1. The magnetic direction of rocks along the surface of Earth - This information is crucial as it helps to identify the orientation of the Earth's magnetic field at various points in geological time, which is fundamental in creating a geomagnetic time scale.

  2. The age of rocks along the surface of Earth - Knowing the age of the rocks allows scientists to correlate the magnetic directions with specific time periods, creating a timeline of geomagnetic reversals and other changes.

The other options (average speed of tectonic plates and the length of the mid-oceanic ridge) are not directly necessary for constructing a geomagnetic time scale.