Where's the oldest place on Earth? Because plate tectonics constantly recycles our planet's crust, that's a difficult question to answer. Even so, scientists think they've done it: crystals discovered in the Jack Hills of western Australia appear to put them on the oldest continental crust on Earth.
How Old Is That?
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How To Date A Planet
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Key Facts In This Video
Earth's outermost layer is constantly renewing itself, making the planet appear "younger." 00:21
The mineral zircon is durable, like quartz, but contains small traces of radioactive uranium. 01:31
Uranium-lead dating of zircon tells us that the Earth is at least 4.4 billion years old. 02:33