Answer:
The different phases of the moon are caused by the angle that sunlight is reflected of off the moon towards earth. As the moon rotates around earth the angle changes and we see different fractions of the moon. When the earth is completely between the moon and the sun there is a dark new moon, and when the moon gets to a point in its orbit where the entire surface facing the earth reflects light, then it is a full moon.
Step-by-step explanation: