Program: ANCIENT EARTH: BIRTH OF THE SKY
Series:	NOVA
Length:	56 min.
Link:	http://www.pbs.org/wgbh/nova/
Air Times:	Sorry, no times scheduled.
Grade Levels:	High School
Program Description
Early Earth was a hellscape of molten lava and barren rock, bombarded by meteors, with no atmosphere at all. How did our familiar blue sky - the thin, life-giving band of gasses protecting our planet - come to be?