Phases of the Moon

1. a) Phases of the Moon are caused by the different positions of the Sun and the Earth to the 
Moon.
    b) These changes occur when the Moon revolves round the Earth. At the same time, the Earth and Moon revolve round the Sun.
2. As the Moon is illuminated by the Sun, half of the Moon is bright while the other half is dark.
3. From Earth, the Moon can be seen at different angels on different nights.

4. Therefore, different shapes of the Moon are seen on different nights.
5. The shape of the Moon depends on how much of the illuminated part of the Moon faces the Earth.

                                                                     Phases of the Moon