plants
Cut through an old tree stump and you'll see circle after circle, like a bullseye made of wood.
A tree typically grows one new ring inside its trunk every year, so counting rings from the center outward tells you exactly how many years that tree has lived.
Rings don't predict future height, since they only record growth that already happened. They also don't reveal past leaf color, since ring patterns are about width and growth conditions.
Scientists read tree rings to learn about past weather too — thicker rings form in good growing years, thinner ones can reveal droughts.
plants
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