https://padlet.com/cameronparchment/urllj2nuz903 en-us 2017-03-19 23:25:15 UTC 2017-03-19 23:40:02 UTC hello@padlet.com https://padlet-assets.s3.amazonaws.com/icons/Planets.png cameronparchment https://padlet.com/cameronparchment/urllj2nuz903/wish/161039004 The process of finding out how old the Earth is goes by finding rocks and measuring their age. Rocks are the oldest thing on Earth. Scientists use radiometric dating the most well known type is radiocarbon dating.  Trying to find very old rocks is difficult since the Earth is constantly recycling it's own rock. Currently the oldest rock on Earth is the zircon rock which was found in Australia. It is 4.374 billion years old. It could be older though by a few hundred million years or so.

Source: http://www.smithsonianmag.com/smart-news/how-do-we-know-earth-46-billion-years-old-180951483/ ]]> 2017-03-19 23:27:19 UTC https://padlet.com/cameronparchment/urllj2nuz903/wish/161039004