Radioactive isotopes in dating the past blacksingles dating sites
A fossil can be studied to determine what kind of organism it represents, how the organism lived, and how it was preserved.
Just as when they were deposited, the strata are mostly horizontal (principle of original horizontality).
Despite seeming like a relatively stable place, the Earth's surface has changed dramatically over the past 4.6 billion years.
Mountains have been built and eroded, continents and oceans have moved great distances, and the Earth has fluctuated from being extremely cold and almost completely covered with ice to being very warm and ice-free.
However, the age of each fossil primate needs to be determined so that fossils of the same age found in different parts of the world and fossils of different ages can be compared.
There are three general approaches that allow scientists to date geological materials and answer the question: "How old is this fossil?
Search for radioactive isotopes in dating the past:
These changes typically occur so slowly that they are barely detectable over the span of a human life, yet even at this instant, the Earth's surface is moving and changing.