How does a moon moves and change to different shape and size?

Question: How does a moon moves and change to different shape and size?

Asked by 587bmay27 to Ann, David, Doris, Grace, Jonathan, Peter on 31 May 2019.
- Jonathan Abuga answered on 31 May 2019:
  
  @587bmay27: I explained this to a different student, but am happy to repeat. I have four fun facts!
  1. The moon gets its light from the sun.
  2. The moon orbits around the earth in about 28 days.
  3. The earth rotates on its own axis in 24 hrs, and
  4. The earth moves around the sun in about 365 days.
  Since we are not moving at the same speed with the universe around us, these movements change the appearance of the size ad shape of the moon. In reality, the size and shape of the moon doesn’t change at all.
- Grace Kago answered on 4 Jun 2019:
  
  The Moon looks like it is changing shape since we see different amounts of the lit part as the Moon orbits Earth.

Question: How does a moon moves and change to different shape and size?