‘Mom, why is the sky blue?’

Here’s your sim­ple answer mom:

When the dif­fer­ent col­ors of light pass through the atmos­phere, they run into tiny water mol­e­cules. Blue-ish col­ors have short wave­lengths which pass through small mol­e­cules eas­ily. That’s it!

For more answers to com­mon kid ques­tions, check out:

http://news.yahoo.com/easy-answers-kids-most-burning-questions-133804573.html