Question

why earth rotating on it axis

answer please

Answer 1

Earth has magnetic field with North & South Poles. The axis of rotation is different from the magnetic poles. This difference creates force for the earth to rotate on its axis. The same is the case with all planets in the Solar System.

Answer 2

At the centre of the earth is a huge ball of liquid iron. It is always spinning and causes the earth to spin with it. Every few million/billion years the iron core shifts its direction of spin. When it does, the entire eco-system could be wiped out (if it's a big enough shift). Mega tsunamis, total change of weather systems, etc. Antartica could end up in the tropics.