Relative dating simply says one is older than the other but no age is specified. Tools like radiometric dating allow some samples to be assigned a certain age to within some accuracy. Assigning a certain age or date is a form of absolute dating. Sciences such as geology, paleontology and archeology are very interested in identifying the age of objects found and these scientists sometimes use either relative dating or absolute dating to characterize the age of the objects they study.
Before radiometric dating it was difficult to determine the actual age of an object. If an archaeologist is studying past civilizations, the archaeologist may be able to say that in a particular location the ruins of once civilization hook up sites delhi found to have been build on another and so the layers unearthed in an excavation convey the sequence of historical occupations without revealing the actual dates.
If the archaeologist finds a sample suitable for carbon dating, then an absolute date may be assigned to an object. Similarly for paleontologists who find layers of fossils. Radioactive isotopes can also be used by a paleontologists to assign an age to a fossil in some cases and that is an example of absolute dating with radiometric methods.
Many trees in temperate zones produce one growth-ring each year, with the newest adjacent to the bark. Hence, for the entire period of a tree's life, a year-by-year record or ring pattern builds up that reflects the age of the tree and the climatic conditions in which the tree grew.
Adequate moisture and a long growing season result in a wide ring, while a drought year may result in a very narrow one. Direct reading of tree ring chronologies is a complex hook up sites delhi, for several reasons.