Defination of dating
Uranium-lead (U-Pb) dating: Radioactive uranium comes in two forms, uranium-238 and uranium-235.
The number refers to the number of protons plus neutrons.
The half-life of uranium-238 is 4.47 billion years, while that of uranium-235 is 704 million years.
The following is an example of one state's defintion of a dating relationship: " As used in this section, “dating relationship” means frequent, intimate associations primarily characterized by the expectation of affectional involvement.
If you want to know how old someone or something is, you can generally rely on some combination of simply asking questions or Googling to arrive at an accurate answer.
This applies to everything from the age of a classmate to the number of years the United States has existed as a sovereign nation (243 and counting as of 2019).
Say a second friend who is aware of this arrangement visits and notices that your carton of ice cream contains 70 raisins and 10 chocolate chips.
She declares, "I guess you went shopping about three days ago." How does she know this?
U-Pb dating is complex because of the two isotopes in play, but this property is also what makes it so precise.