Scientists use a special kind of clock that’s hidden inside rocks and fossils. It’s like having a really, really slow timer, so slow it takes millions of years to tick once! They call this process radiometric dating, and it helps them know when the Earth was born.
Examples
- If you had a clock that took one million years to tick once, and it had been ticking for 4.5 billion years, you'd have counted 4,500 ticks!
- Imagine your grandma’s old birthday cake, if each layer represents 100 million years, the Earth is like a cake with 45 layers!
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See also
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Categories: Science · geology,radiometric dating,earth science