Question
Which information is needed to construct a geomagnetic time scale? Select the two correct answers.(1 point)
Responses
the age of rocks along the surface of Earth
the age of rocks along the surface of Earth
the magnetic direction of rocks along the surface of Earth
the magnetic direction of rocks along the surface of Earth
the average speed of tectonic plates on Earth
the average speed of tectonic plates on Earth
the length of the mid-oceanic ridge
Responses
the age of rocks along the surface of Earth
the age of rocks along the surface of Earth
the magnetic direction of rocks along the surface of Earth
the magnetic direction of rocks along the surface of Earth
the average speed of tectonic plates on Earth
the average speed of tectonic plates on Earth
the length of the mid-oceanic ridge
Answers
GPT-4o mini
The two correct answers needed to construct a geomagnetic time scale are:
1. **The age of rocks along the surface of Earth** - This information is essential to correlate the magnetic reversals with specific time periods.
2. **The magnetic direction of rocks along the surface of Earth** - The orientation of the magnetic minerals in the rocks records the Earth's magnetic field at the time of their formation, which is crucial for constructing the geomagnetic time scale.
These two pieces of information are required to understand the history of Earth's magnetic field changes over geological time.
1. **The age of rocks along the surface of Earth** - This information is essential to correlate the magnetic reversals with specific time periods.
2. **The magnetic direction of rocks along the surface of Earth** - The orientation of the magnetic minerals in the rocks records the Earth's magnetic field at the time of their formation, which is crucial for constructing the geomagnetic time scale.
These two pieces of information are required to understand the history of Earth's magnetic field changes over geological time.