Answer:
C. its age
Explanation:
Rex is most likely trying to figure out the age of the rock formation. It is usually done by comparing the isotopic ratios of the daughter to the parent and their decay rates.
- This is known as radiometric dating.
- Here an exact numerical age of the rock is usually obtained by measuring these isotopic ratio.
- The rate of decay serves as a clock to measure how far the radioactive material has decayed in time
The Earth's magnetic field is in a weakening stage right now.
Cause it isn’t fair.Like the electrol college the people’s vote don’t count as much as the delegates in the electoral college which gives a negative response to U.S citizens
C. subsistence; <span>it's self-sufficiency farming where the farmers focus on growing enough food to feed themselves and their families</span>
