What causes lunar phases?

 The moon phase name is shown alongside the image. The dotted line from the earth to the moon represents your line of sight when looking at the moon. So the basic explanation is that the lunar phases are created by changing angles (relative positions) of the earth, the moon and the sun, as the moon orbits the earth.

Explanation:

the moon phase name is shown alongside the image. The dotted line from the earth to the moon represents your line of sight when looking at the moon. So the basic explanation is that the lunar phases are created by changing angles (relative positions) of the earth, the moon and the sun, as the moon orbits the earth.

Explanation:

: b : o   : 0 ; b : - )  

: b: b: b: b: b: b: b: b: b

the dictionary definition of ubiquitous is "present, appearing, or found everywhere".