Reveal patterns of change in graphical displays Practice

Question 1 of 5

What pattern does this graphic represent?

Cartoon of Moon-Earth Orbit, illustrating the phases of the moon. The cartoon is labeled Moon-Earth-Sun as viewed from above our solar system. The Earth sits in the center of eight images of the moon at different places in the lunar cycle. To the right the Sun shines on the Moon Earth system.

Source of Graphic: https://starchild.gsfc.nasa.gov/docs/StarChild/questions/question3.html