Imagine if Earth suddenly lost
an entire continent.
North America wouldn't just vanish
off the face of the planet, of course.
Instead, it would sink into the oceans.
One billion years ago, the continents
meshed together into one supercontinent
called Rodinia.
But don't mistake it for Pangea,
that came long after.
During the era of Rodinia,
the continental crust that forms the continents
was at its thickest.
From that point on,
it began to slowly erode and sink.
At this rate of erosion,
some two billion years from now,
the continents will be fully submerged once again.
I'm not ready to wait that long.
What do you say we speed things up
for North America a little?
How exactly would this work?
Remember what I just said about Rodinia
and continental crust thickness?
That's right.
The continents are shrinking and sinking.
In our scenario, it would just happen
much faster to North America.
The half-billion people that live in North America
would lose their homes.
They'd have to move out to another continent.
But since events were unfolding so fast,
the airlines would be unable to cope
with so many passengers.
A lot of people would be left behind
and go down with the continent.
And those who were lucky enough to flee
would cause a refugee crisis worldwide.
You might know that continents
don't just float in the ocean.
They sit on the layer of solid rock,
known as the upper mantle.
This upper mantle and the Earth's
outermost layer, the crust,
are broken into tectonic plates.
And North America just happens to sit on one of them.
If the continent was to submerge,
it would have to do with the North American
tectonic plate going down.
And this is where the bad news would start.
The sinking of one tectonic plate
would shift other plates around.
This would trigger anything from
tsunamis and earthquakes
to volcanic eruptions.
They might be massive enough
to wipe out humanity altogether.
At the same time, the sea level would rise significantly.
This would flood other areas of the world,
displacing even more people
and destroying more communities.
It wouldn't help that parts of North America are covered with ice.
All that ice would float and then melt,
adding to the effects of climate change.
If you were still alive,
you'd have to invest in some powerful air conditioning
because it would get very hot, very quickly.
The countless volcanoes and other natural disasters
unleashed by North America's bold move
would make it tough to continue farming.
So I hope you like canned food.
And maybe, you might want to go live underground
until the Earth cooled off a bit.
But that's a story for another WHAT IF.