Question

Hello ..
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My question is what will be the immediate effect if earth stop revolving suddenly ? ​

Answer 1

Life could continue in a narrow twilight zone between the hot and cold halves. But this twilight zone would slowly creep around the planet over the period of a year, as the Earth did its annual orbit around the Sun.

To make it easier to work out what would happen, let's pretend the oceans don't freeze on the cold side, or evaporate on the hot side. And let's look only at centrifugal force, which should really be called centripetal force.

Over several billion years, this force, which effectively pushes outwards, has made the planet a bit fatter around the middle. So the diameter of the Earth measured through the equator is today about 21.4 kilometres more than the diameter of the Earth measured through the poles.

But this bulge in the solid Earth took billions of years to slowly develop. This is because the solid matter moved only very slowly in response to the outward force caused by the spin of the planet.

But the liquid water in the oceans is far more mobile and responsive to forces. So the Earth's spin has pushed up this liquid water to an 'abnormal' elevation of about eight kilometres.

In other words, at the equator, thanks to the spinning Earth, the water has been pushed up some eight kilometres higher than in the case of the Earth having no spin.

But today, on the entire equator, the deepest part of the oceans is only about 5.75 kilometres.

So take away the spin and you take away all water at the equator.