When they're at the age of wonder, children often ask question after question. Some moms find themselves hard pressed for answers, so take this quiz and see if you are well informed!

1 of 7

Why is the sky blue?

Image source: Flickr User ronnie44052

2 of 7

What is air made of?

Image source: Flickr User WTL photos

3 of 7

How many bones does the human body have?

Image source: Flickr User Kim Scarborough

4 of 7

What is night?

Image source: Flickr User NASA Goddard Photo and Video

5 of 7

Why is the ocean salty?

Image source: Flickr User Repoort

6 of 7

How much do fingernails grow in a month?

Image source: Flickr User nikoretro

7 of 7

How many hairs do humans have on their head?

Image source: Flickr User e³°°°