Definition of relative dating
Correlation can involve matching an undated rock with a dated one at another location.
Suppose you find a fossil at one place that cannot be dated using absolute methods.
"Mom," she said hesitantly, "I really appreciate your feelings, but, in all honesty, how can you say you love someone you've never met?
At the end of the conversation, her mother said, "Darling, I want you to know we love you, and we love David." Susan was a bit dubious.
"Tell you what: I'll define it, and you raise your hands if you agree. When she called her parents to tell them the good news, they were elated.