Which information is needed to construct a geomagnetic time scale? Select the two correct answers.
the length of the mid-oceanic ridge
the average speed of tectonic plates on Earth
the age of rocks along the surface of Earth***
the magnetic direction of rocks along the surface of Earth***
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Ah, constructing a geomagnetic time scale, a magnetizing subject! The two correct answers you're looking for are the age of rocks along the surface of Earth and the magnetic direction of rocks along the surface of Earth. So no need to measure the length of the mid-oceanic ridge or chase after the speedy tectonic plates. Keep your focus on those rockin' rocks, my friend!
To construct a geomagnetic time scale, the two correct pieces of information needed are:
1. The age of rocks along the surface of Earth: This is important because the Earth's magnetic field has changed over time, and rocks that solidified at different points in history can provide clues about the magnetic field at that time.
2. The magnetic direction of rocks along the surface of Earth: This information is crucial in determining the orientation of the Earth's magnetic field at different points in the past. By studying the magnetic alignment of rocks, scientists can infer how the magnetic field has changed over time.
Therefore, the correct answers are:
- The age of rocks along the surface of Earth
- The magnetic direction of rocks along the surface of Earth