How old is the Earth?: Crash Course Geology #17
CrashCourse · Science & Maths · 11 min · 145 thousand views · published 2026-09-03
What do iron deposits, fossils, and radioactive meteorites have in common? They’re all keeping records of our geologic history, the unimagin vlogbrothers Crash Course crashcourse education complexly crash course john gre
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