Which information is needed to construct a geomagnetic time scale? Select the two correct answers.(1 point)
Responses
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
the age of rocks along the surface of Earth
the average speed of tectonic plates on Earth
the magnetic direction of rocks along the surface of Earth
the age of rocks along the surface of Earth
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 involves studying the orientation of magnetic minerals within rocks, which can provide valuable information about the Earth's magnetic field in the past.
2. The age of rocks along the surface of Earth: Determining the age of rocks through various dating methods, such as radiometric dating, allows scientists to establish the sequence of events and changes in the Earth's magnetic field over time.
The length of the mid-oceanic ridge and the average speed of tectonic plates on Earth are not directly related to constructing a geomagnetic time scale.
The correct answers are:
1. The magnetic direction of rocks along the surface of Earth. By determining the magnetic direction of rocks, scientists can track the changes in Earth's magnetic field over time.
2. The age of rocks along the surface of Earth. Knowing the age of rocks helps in establishing a timeline or chronology, which is essential for constructing a geomagnetic time scale.