Question

Which information is needed to construct a geomagnetic time scale? Select the two correct answers.(1 point)
Responses

the average speed of tectonic plates on Earth
the average speed of tectonic plates on Earth

the magnetic direction of rocks along the surface of Earth
the magnetic direction of rocks along the surface of Earth

the length of the mid-oceanic ridge
the length of the mid-oceanic ridge

the age of rocks along the surface of Earth

Answer 1

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

1. **The magnetic direction of rocks along the surface of Earth**
2. **The age of rocks along the surface of Earth**

These two pieces of information are crucial for understanding the history of Earth's magnetic field and how it has changed over geologic time.