How the Earth Works

Geologic History—Dating the Earth

Documentary Feb 25, 2008 31 min The Great Courses Signature Collection

Available on Prime Video, The Great Courses Signature Collection

S1 E2: Discovering Earth's exact age took centuries of detective work. Rock strata provide relative ages, but only with the discovery of radioactivity was it possible to determine the absolute geologic timescale.

Documentary Feb 25, 2008 31 min The Great Courses Signature Collection

TV-PG

Information

Released: 2008
Run Time: 31 min
Rated: TV-PG

Languages

Original Audio: English
Audio: English (AAC), English (United States)
Subtitles: English (CC)

Accessibility

: Closed captions (CC) refer to subtitles in the available language with the addition of relevant non-dialogue information.