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The history of Earth concerns the development of planet Earth from its formation to the present day. The geological time scale GTSas defined by international convention,  depicts the large spans of time from the beginning of the Earth to the present, and its divisions chronicle some definitive events of Earth history. In the graphic: Dating earths history means "billion years ago"; Ma"million years ago". Earth formed around 4. Much of the Earth was molten because of frequent collisions with other bodies which led to extreme volcanism. While the Earth was in its earliest stage Early Eartha giant impact collision with a planet-sized body named Theia is thought to have formed the Moon.
Age dating the Earth Geochronology is the scientific study of the age of the Earth and the temporal sequence of events related to the formation of the planet and the history of life on Earth. The word dating earths history derived from Geo meaning Earthand chronologywhich is the study of time, or a record of events in the order of their occurrence timeline. It is from this field of study that fossils and artifacts are dated based on the perceived age of the geological layers in which they are located. Geologists determine the age of rocksfossilsand sediments using a variety of methods including relative and absolute dating.
Our planet has existed for 4. Here are the 25 biggest milestones in Earth's history. From leaps forward in evolution to devastating asteroid impacts, these were the turning points that shaped our world. Earth grew from a cloud of dust and rocks surrounding the young Sun.
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Datingin geologydetermining a chronology or calendar of events in the history of Earthusing to a large degree the evidence of organic evolution in the sedimentary rocks accumulated through geologic time in marine and continental environments. To date past events, processes, formations, and fossil organisms, geologists employ a dating earths history of techniques. These include some that establish a relative chronology in which occurrences can be placed in the correct sequence relative to one another or to some known succession of events. Radiometric dating and certain other approaches are used to provide absolute chronologies in terms of years before the present. The two approaches are often complementary, as when a sequence of occurrences in one context can be correlated with an absolute chronlogy elsewhere. Local relationships on a single outcrop or archaeological site can often be interpreted to deduce the sequence in which the materials were assembled.
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The age of the Earth is estimated to be 4. Following the development of radiometric age-dating in the early 20th century, measurements of lead in uranium-rich minerals showed that some were in excess of a billion years old. It is hypothesised that the accretion of Earth began soon after the formation of the calcium-aluminium-rich inclusions and the meteorites. Because the time this accretion process took is not yet known, and predictions from different accretion models range from a few million up to about million years, the difference between the age of Earth and of the oldest rocks is difficult to determine. It is also difficult to determine the exact age of the oldest rocks on Earth, exposed at the surface, as they are aggregates of minerals of possibly different ages.