Narnia to Kris Crawford, age 8, of Glasford, I11., for this question:

WHAT IS A CLOUD MADE OF?

There are many different types of clouds. Some look like huge soft balls of cotton, others look for all the world like feathers that have escaped from a giant pillow. Others are dull gray or even downright black. It seems almost impossible to believe that all clouds are made from just two basic ingredients.

One main ingredient is air, the ordinary air we breathe day and night. The second ingredient is water. And though this is in the form of misty mini droplets, the total water in a cloud weighs much more than its air.

Also in the cloud are tiny fragments of salt from the sea, specks of smoke from factory chemineys plus traces of all sorts of dusty debris. But always the two main ingredients are air and misty droplets of water.