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The Mystery Behind Earth’s Missing Rocks: Crash Course Geology #16

CrashCourse · Science & Maths · 10 min · 47 thousand views · published 2026-08-20

The Mystery Behind Earth’s Missing Rocks: Crash Course Geology #16

How did over one billion years of history go missing? In this episode of Crash Course Geology, we’ll tour the Grand Canyon and discover how vlogbrothers Crash Course crashcourse education complexly crash course john gre

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