When earth is between the moon and the sun, the fully lit face of the moon is seen from earth. this phase of the moon is called a moon.
a) crescent
b) full
c) gibbous
d) new

When Earth is between the Moon and the Sun, the fully lit face of the Moon is seen from Earth. This phase of the Moon is called a new moon.

>Crescent --the first sliver of the Moon that we can see; has illuminated edge                      of the Moon on the right
>Full          --The phase which is the brightest in the sky. 
>Gibbous  -- Not yet full moon; Moon is more illuminated that half,