Riddle

I am in the sky. I'm white, I'm round, but not always. Sometimes you see me, sometimes you don't. What am I?

Choose an answer

A.Sun
B.Cloud
C.Star
D.Moon
Hint: It's a word with 4 letters, starting with "M".

Answer

Moon

Why this is the answer

The moon appears white and round in the sky, but its visible shape changes through phases, and it's not always visible depending on the time of day and weather.

This riddle is filed under "What Am I?" Riddles and rated Easy.