Planet Earth doesn't have a birth certificate to record its formation, which means scientists spent hundreds of years struggling to determine the age of the planet. So, just how old is Earth? By dating the rocks in Earth's ever-changing crust, as well as the rocks in Earth's neighbors, such as the moon and visiting meteorites, scientists have calculated that Earth is 4. Related: How Big is Earth? Scientists have made several attempts to date the planet over the past years. They've attempted to predict the age based on changing sea levels, the time it took for Earth or the sun to cool to present temperatures, and the salinity of the ocean.
Creation 101 Radiometric Dating And The Age Of Earth
How Old is Earth, and How Do We Know? | Evolution: Education and Outreach | Full Text
In the solar system, the Earth is the third planet from the sun, and it is the only planet known to have life. According to different sources of evidence like radiometric dating, the Earth is believed to be more than 4. Out of the four terrestrial planets , the Earth is the largest and densest planet. The lithosphere is made up of numerous tectonic plates that keep moving over millions of years. The ability of the Earth to harbor life makes the Earth a unique planet in the solar system, and this stems from the fact that water in liquid form exists on the planet. Similarly, the existence of gaseous oxygen in the atmosphere of the Earth also supports life. It is believed that about 4 billion years ago, a chemical reaction was triggered which led to the first self-replicating molecules.
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Age of Earth
The age of 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.
Chronological dating , or simply dating , is the process of attributing to an object or event a date in the past, allowing such object or event to be located in a previously established chronology. This usually requires what is commonly known as a "dating method". Several dating methods exist, depending on different criteria and techniques, and some very well known examples of disciplines using such techniques are, for example, history , archaeology , geology , paleontology , astronomy and even forensic science , since in the latter it is sometimes necessary to investigate the moment in the past during which the death of a cadaver occurred. Dating methods are most commonly classified following two criteria: relative dating and absolute dating.