Question

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

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

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 age of rocks along the surface of Earth
the age of rocks along the surface of Earth

Answer 1

To construct a geomagnetic time scale, the two correct pieces of information needed are:

1. **The magnetic direction of rocks along the surface of Earth** - This helps in understanding the historical geomagnetic field orientations and variations over time.

2. **The age of rocks along the surface of Earth** - This provides a timeframe for when specific magnetic orientations occurred, allowing for the construction of a chronological scale of geomagnetic reversals and patterns.

So the correct answers are:
- the magnetic direction of rocks along the surface of Earth
- the age of rocks along the surface of Earth