History of the Earth Season 1, Episode 2: What Was Earth Like 4 Billion Years Ago?

How Did The Earth Form?

An overview of fractionation, Mara's survival, 'Grand Tack' theory, formation of Mercury, solidifying Earth, and theories surrounding Theia.

18 min

The Mystery of the Late Heavy Bombardment

20 min

Where Did Earth's Water Come From?

32 min

How Did Life Begin?

22 min

What Was The Last Common Ancestor of all Life on Earth?

24 min

Were Volcanoes The Key To Life?

21 min

Did Life on Earth Come From Space?

17 min

What Would The Earth Have Been Like Without Life?

21 min

What is the Oldest Fossil on Earth?

31 min

How The Earth Got Its Magnetic Field (And Why It Might Not Protect Us Much Longer)

23 min

What Was Earth Like 3 Billion Years Ago?

27 min

How Bad Was The Great Oxidation Event?

27 min

How Did Life Recover From The First Mass Extinction?

28 min

What Would The Earth Be Like Without Photosynthesis?

World Without Photosynthesis

35 min

What Was The First Virus?

Older Than Life? Evolution of Viruses

27 min

What Is The Other 99.99% Of Life?

4 Billion Years of Life: Tour of the Biosphere

32 min

What Was The Earth Like 2 Billion Years Ago?

2 Billion Years Ago: After The Great Flood

32 min

A Tour of Earth's Ancient Supercontinents

Before Pangaea

49 min

A Tour of Earth's Ancient Superoceans

Exploring Earth's Prehistoric All Sea

43 min

What Was The "Boring Billion" Really Like?

1.8 to 0.8 Billion Years Ago: Earth's Lost Billion Years

36 min

What Was The First Complex Life on Earth?

Earth's Impossible Fossils

60 min

What Was The Earth Like 1 Billion Years Ago?

One Billion Years Ago: Is This Eden?

43 min

What Was The First Fungus?

The Key to Life? Evolution of Fungi

62 min

Why Did The Earth Totally Freeze For 100 Million Years?

Snowball Earth

49 min

Were These The First Animals?

The Ediacaran: Life's Failed Experiment?

54 min

How Far Back In Time Could You Have Survived On Earth?

How Far Back In Time Could You Have Survived On Earth?

57 min