4 billion-year-old chunk of Earth’s crust found beneath Australia

4 billion-year-old chunk of Earth’s crust found below Australia

A 4-billion-year-old piece of Earth’s crust the dimensions of Ireland is lurking beneath Western Australia, new evaluation finds. 

This piece of crust is among the many many oldest on Earth, though not the oldest. That honor goes to rocks of the Canadian Shield (opens in new tab) on {the japanese} shore of the Hudson Bay, which have been dated to 4.3 billion years earlier. (The Earth is 4.54 billion years earlier.) Because Earth’s crust is regularly being churned up and pushed once more into the mantle by plate tectonics, most of the planet’s rocky ground was formed all through the ultimate couple billion years. 

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