Differentiate between relative dating and radiometric dating
This radioactive decay takes place at a constant rate for each radioactive element.
Scientists know exactly how long it will take for half the quantity of the element to change, and this state is known as its half-life.
The object's approximate age can then be figured out using the known rate of decay of the isotope.
For organic materials, the comparison is between the current ratio of a radioactive isotope to a stable isotope of the same element and the known ratio of the two isotopes in living organisms.
The textbooks speak of the radiometric dating techniques, and the dates themselves, as factual information.
Scientists find out the age of a dinosaur fossil by dating not only the rocks in which it lies, but those below and above it.
Sometimes, scientists already know the age of the fossil because fossils of the same species have been found elsewhere and it has been possible to establish accurately from those when the dinosaur lived.
Geologists call this the principle of lateral continuity.
A fossil will always be younger than fossils in the beds beneath it and this is called the principle of superposition.
Knowing this first: that scoffers will come in the last days, walking according to their own lusts, and saying, “Where is the promise of His coming?