Aplanet rotating causes cycles of day and night on that planet, and rotation simply means how long it takes a planet to spin on its axis. Given these facts, what causes day and night cycles on a planet among the following options:
- seasons
 - carbon dioxide
 - flow of electrons
 - gravitational pull
 - fissures of hot, acidic water
 - spinning on its axis
 - heat energy
 - energy of moving objects


 

      spinning on its axis   