- The radioactive isotope content of a rock means the amount of elemental isotopes of the parent isotopes
- Calculating the age of rocks requires investigating the original amount of the elemental isotopes of the parent isotopes
- Therefore, calculating the age of rocks requires investigating the radioactive isotope content of that rock

- Calculating the age of rocks requires investigating the radioactive isotope content of that rock
- Radiometric dating is a kind of method to determine the absolute age of the rock
- So, radiometric dating requires the radioactive isotope content of a rock

- Radiometric dating requires the radioactive isotope content of a rock
- Radiometric dating is used to identify / determine the absolute age of the rock
- Therefore, the radioactive isotope content of a rock can be used to identify the absolute age of the rock

- The radioactive isotope content of a rock can be used to identify the absolute age of the rock
- The absolute age of a rock is the amount of time passed since a rock was formed
- Therefore, the radioactive isotope content of a rock can be used to identify the amount of time passed since a rock was formed

Therefore, the radioactive isotope content of a rock can be used to identify the amount of time passed since a rock was formed
Question
The radioactive isotope content of a rock can be used to identify which property of the rock?

Context
- The radioactive isotope content of a rock means the amount of elemental isotopes of the parent isotopes 
- Radiometric dating is used to identify / determine the absolute age of the rock 
- The absolute age of a rock is the amount of time passed since a rock was formed 
- Radiometric dating is a kind of method to determine the absolute age of the rock 
- Calculating the age of rocks requires investigating the original amount of the elemental isotopes of the parent isotopes