How Old is the Earth?

The Earth is super old, about 4.5 billion years old!

Imagine you have a really long toy train track. If each year was like one inch of track, the whole Earth's age would be a track as long as 12 football fields put together!

But how do we know that? Well, scientists use something called rocks, which are like the Earth’s memory. Some rocks have tiny clocks inside them, they’re called radioactive atoms. These special atoms slowly change over time, and scientists can count how many changes happened to figure out when the rock was made.

Think of a chocolate bar that melts really, really slowly. If you started melting it 4.5 billion years ago, it would just now be done! That’s how old the Earth is, like a giant, slow-melting chocolate bar! The Earth is super old, about 4.5 billion years old!