A Brief History of Geologic Time
5 years ago
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[{"text":"By looking at the layers beneath our feet, geologists have been able to identify and describe crucial episodes in life's "},{"text":"history","bold":true},{"text":"."}]
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{"title":"A Brief History of Geologic Time by PBS Eons 3,764,376 views 5 years ago 12 minutes, 8 seconds","duration":"12 minutes, 8 seconds"}