The relative dating is the technique used to know that which object or item is older in comparison to the other one.
The atomic nucleus that decays is called the parent isotope.
When the magnetic north pole is close to the geographic north pole as it is todayit is called normal polarity.
Most absolute dates for rocks are obtained with radiometric methods.
Description: Through geologic time, the polarity of the Earth's magnetic field has switched, causing reversals in polarity. In this case, fossils can be useful tools for understanding the relative ages of rocks.