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Answer: agate geode banding

by ApatiteBlue · 4 guesses · easy

💡 Fun Fact

# Agate Geode Banding The vibrant stripes in agate geodes form so slowly that each band can take *thousands of years* to develop—meaning a geode the size of your fist might contain a timeline stretching back millions of years in just a few inches of stone. Even wilder: scientists can sometimes read these bands like tree rings to figure out what the ancient environment was like when each layer formed, including clues about temperature and mineral-rich water conditions from deep in Earth's past.

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