Ancient Earth was a water world—evidence is mounting that some 3 billion to 4 billion years ago, the planet’s oceans held nearly twice as much water, enough to submerge today’s continents above the peak of Mount Everest.

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Serious question, where did all that water go? Did the planet have an atmosphere at that point or did atmosphere as we know it get created due to that water? I’m totally imagining a total recall like event where an earthquake opened a fissure and the magma turned a bunch of the ocean into breathable air.

pinko_mcfly

> the planet’s oceans held nearly twice as much water > enough to submerge today’s continents above the peak of Mount Everest These cannot both be accurate. The average ocean depth today is 3600m. Double that amount of water, which wouldn’t even be double the depth since it would trade depth for extra surface area, and it’s still 5200m short of Mt Everest. Let’s see, the average land height is 841m and covers 29% of the surface. By my calculations, you’d need to (almost exactly!) quintuple the amount of water to flood the modern day Himalayas.

Dyolf_Knip

Someone should have kept this from Kevin Costner.

surreal_bohorquez

Mt Everest at its present day height, or its height back then? Were there even higher mountains?

RedRose_Belmont

Another 3 billion to 4 billion in the future and the Earth will be a desert world.

brownbesack