The Earth is like a big, old tree. We can count its rings to see how old it is. Scientists use rocks and fossils, like clues in the ground, to figure out when things happened long ago.
Examples
- A tree grows rings every year, and we count them to know how old it is. Scientists use rocks like zircon crystals to do the same thing, but over billions of years.
- Fossils in layers of rock are like clues left by ancient animals. If a fossil is buried deeper, it might be older than one closer to the surface.
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See also
- How Did the Pyramids Stay Standing for Thousands of Years?
- Why Did the Roman Empire Fall?
- How Does the Ancient Roman Calendar Work?
- How Did Ancient Civilizations Count Without Numbers?
- How Do We Know What People Thought Long Ago?
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Categories: History · geology,fossils,age of the earth