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The oldest rocks on Earth found to date are the Acasta Gneisses in northwestern Canada near the Great Slave Lake, which are 4.03 billion years old.Rocks older than 3.5 billion years can be found on all continents.Related: Nola Taylor Redd is a contributing writer for She loves all things space and astronomy-related, and enjoys the opportunity to learn more.Since the planet Earth doesn't have a birth certificate to record its formation, scientists have spent hundreds of years struggling to determine the age of the planet.By dating the rocks in the ever-changing crust, as well as neighbors such as the moon and visiting meteorites, scientists have calculated that Earth is 4.54 billion years old, with an error range of 50 million years.Although no rocks have been deliberately returned from Mars, samples exist in the form of meteorites that fell to Earth long ago, allowing scientists to make approximations about the age of rocks on the red planet.

In the early 20th century, scientists refined the process of radiometric dating.

Several attempts to scientifically date the planet have occurred over the past 400 years.

Scientists 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.

Greenland boasts the Isua Supracrustal rocks (3.7 to 3.8 billion years old), while rocks in Swaziland are 3.4 to 3.5 billion years.

Samples in Western Australia run 3.4 to 3.6 billion years old.

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