Next time you find a cliff or road cutting with lots of rock strata, try working out the age order using some simple principles: Fossils are important for working out the relative ages of sedimentary rocks.
The method of reading the order is called stratigraphy (layers of rock are called strata).
Relative dating does not provide actual numerical dates for the rocks.
This site stores nothing other than an automatically generated session ID in the cookie; no other information is captured.
In general, only the information that you provide, or the choices you make while visiting a web site, can be stored in a cookie.
For example, the site cannot determine your email name unless you choose to type it.
Allowing a website to create a cookie does not give that or any other site access to the rest of your computer, and only the site that created the cookie can read it.