Answer
1. oblate spheroid.
2. the moon don't really change its shape but to be specific is a no.
3. it depends on where it is in its orbit.
it depends on where it is in its orbit. 4-6. the are 8 different appearance of the moon which are (new moon,waning crescent,last quarter,waxing gibbous,full moon,waning gibbous,last quarter,old crescent)
note: I really don't know the right order of the moon but that's my answer
8-10. as the moon orbit the earth, the sun lights up different parts of it.
that's my answers hope it helps!
