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@worldscifest
The #sea #caves of Wisconsin’s Apostle Islands were shaped by a cycle of #wave action, #freezing, and thawing which sculpted the malleable #sandstone into a network of passageways. #PhotoOfTheDay #rock #ice #ocean #cave #spelunking #science #geology #nature #Earth #formation 📷 iStock

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    • cave
    • freezing
    • earth
    • spelunking
    • photooftheday
    • sandstone
    • ocean
    • sea
    • caves
    • formation
    • ice
    • nature
    • science
    • geology
    • wave
    • rock