Scientists use two kinds of dating techniques to work out the age of rocks and fossils. This considers the positions of the different rocks in sequence (in relation to each other) and the different types of fossil that are found in them.
The second method is called absolute dating and is done by analysing the amount of radioactive decay in the minerals of the rocks.
Geologic Processes Geological processes have helped to create many iconic features on Earth.
Processes, such as plate tectonics, are what shapes the face of the Earth.
Geology is the study of the composition and physical properties of rocks, minerals, gems and other related earth materials, including diamonds and crystals.
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.In an undisturbed sequence of rocks, such as in a cliff face, it is easy to get a rough idea of the ages of the individual strata – the oldest lies at the bottom and the youngest lies at the top.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.These essential elements often have complex processes that lead to their formation.