how does the cycle of day and night of our earth work?

Answer 1

The earth is rotating on it's axis (which means it's slightly tilted) so when our side of the earth is facing the sun, it's day, and when it's facing away from the sun, it's night.

Hope I helped! :-)

Answer 2

It is due to the rotation of the Earth.

Answer 3

Sorry, Cassie, when I posted my answer yours wasn't there yet. But my computer is very slow, so I guess you posted while my computer was still working on posting my answer..

Answer 4

Actually, the tilt of the axis (23½º) as the Earth orbits around the sun is what causes the seasons.