[MacrohardDoors]

Vast lakes, smaller rivers, puddles, you know?

[JumpCrisscross]

> Vast lakes, smaller rivers, puddles, you know?

The same volume of water was just…higher?

[lazide]

Notably, that is how melting glaciers raise sea levels.

[medstrom]

So where'd the original glacier ice come from? :-) Earth has 1.386 billion cubic km (333 million cubic miles) of water. Lot of glaciers, that.

[lazide]

Not proposing it ever actually happened, but one hypothesis [https://en.m.wikipedia.org/wiki/Snowball_Earth].

Personally, I’m of the ‘shits whack yo’ school of geohistorical projections. So got me. I’m still pondering what weird confluence of events could cause Salt Domes combined with massive oil and natural gas deposits like in the Gulf of Mexico.

Chicxulub?

Something else?

One thing is for sure, the more you understand and analyze the geological record, the more the doomsday preppers seem like insane optimists!

[medstrom]

That's still not really a hypothesis that connects to TFA as we're still basically proposing "well, the water just flowed down from higher up!" Put it this way, Snowball Earth is not itself a hypothesis for where'd the snow come from to make the snowball.

Also doomsday preppers live on the scale of a human lifetime -- you do agree that geological events don't really factor in?

[lazide]

Original water came from comets, and the protoplantary nebula. Notably, as ‘high up’ as it’s possible to get eh? And frozen.

And doomsday preppers are a personality type visible across all civilizations in some form - due to humanities evolved genetic heritage.

Just like every other type.

[eru]

If earth were a smooth sphere, the water would be about 2500m deep.

You can't get that amount of water from lakes, rivers and puddles.

If you want to less of earth by water (than the oceans cover today), you need those parts to be covered in deeper water (on average) than the oceans are today.