What if the earth turned upside down?

Answer 1

In the incredibly unlikely event that the Earth should 'roll over' and reverse its axis, little if anything would change on the surface. The Earth is suspended weightlessly in a frictionless vacuum, and is already both spinning on its axis and hurtling through space. For there to be a terrestrial cataclysm as a result of 'rolling over', the Earth would first have to be both stationary and 'heavy'. Moreover, the Universe would have to exert gravity and possess an 'up' and a 'down'.

The previous answer is not entirely true. If earth were to roll over, any stationary object, by the law of inertia, would tend to stay where it was. Disregarding the rotation of the earth (which is irrelevant anyway), everything on the earth would move toward the south or north, depending on where the poles of rotation are.

Answer 2

If the Earth were to suddenly flip upside down, it would have catastrophic consequences. The oceans would inundate continents, weather patterns would be disrupted, and ecosystems would be devastated. The planet's rotation and gravitational forces are finely balanced, so such a dramatic change would be devastating for life as we know it.