The age of Earth is approximately 4.54 billion years. It is calculated using the radiometric dating methods of meteorite material. These ancient rocks are not from Earth's crust but they are the sediments of the lava deposited in water. The zircon crystals found in Australia, date them to the age of 4.3 billion years, making them the oldest on Earth, so far.
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http://www.wonderwhizkids.com/index.php/planet-earth
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http://www.wonderwhizkids.com/index.php/planet-earth
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