How Volcanoes Froze the Earth (Twice)

Eons

17th July 2019 10 mins Season 3 Episode 22

Over 600 million years ago, sheets of ice coated our planet on both land and sea. How did this happen? And most importantly for us, why did the planet eventually thaw again? The evidence for Snowball Earth is written on every continent today.

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Season 3 · Episode 23

How Earth's First, Unkillable Animals Saved the World

They have survived every catastrophe and every mass extinction event that nature has thrown at them. And by being the little, filter-feeding, water-cleaning creatures that they are, sponges may have saved the world.

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