What is relative dating and how is it used
Explain what an index fossil is and how they are used in relative dating.
Rocks that contain the same fossils may be the assumed to be baekhyun dating seulgi same age.
Describe the potassium-argon technique of absolute dating.
The potassium-argon technique is based on the decay of radioactive fsosils to form calcium and argon.
Artefacts are man made such as coinsfossils were previously living. It is a way of determining whether something is older or younger. The principle of superposition is where one assumes that fossiks layers of sedimentary rock the layers at the top are younger than those beneath them. This principle must be applied with care because distortions of Earth's crusts do occur and sequence of rock layers may rrelative turned upside down.
Index fossils are fossils of great value in this correlation work because they are widely distributed and were present on Earth only ars a limited period of time, making the relative data of strata more precise.
Isotopes are different forms of the same element that have a different number of fssils in the nucleus of their atoms.
This method is based on the assumption (which nearly always holds true) that deeper layers of rock were deposited earlier in Earth's history, and thus are older than more shallow layers.
The successive layers of rock represent successive intervals of time.
Before the advent of absolute dating methods in the twentieth century, nearly all dating was relative.
The main relative dating method is stratigraphy (pronounced stra-TI-gra-fee), which is the study of layers of rocks or the objects embedded within those layers.