What Was Earth Like 4 Billion Years Ago?
27:02
What Was Earth Like 3 Billion Years Ago?
31:31
Where Did Earth's Water Come From?
20:05
The Mystery of the Late Heavy Bombardment
42:50
A Tour of Earth's Ancient Superoceans
35:01
What Would The Earth Be Like Without Photosynthesis?
32:11
What Was The Earth Like 2 Billion Years Ago?
56:39
What Was The Earth Like 500 Million Years Ago?
42:46