Brian Stallcop, age 9, of Spokane, Washington, for his question:

How high do clouds form above the earth?

The clouds come in different types: Some are formed at ten miles or more above our heads. Others form as high as seven miles. Some are formed a mile or so above the earth    and some never get off the ground. The highest clouds are the tops of wild storms. A thunderhead grows when lots of bip, summer clouds pile together. The cloud at the top may be seven, eight, nine or even ten riles high.

Cirrus clouds are those wispy white curly feathers. They are made from tiny fragments of ice. These icy fragments freeze in the chilly air, six or seven miles above our heads. Curtains of flat grey stratus clouds are made of small and smaller droplets of moisture. They form a mile or two miles above land and sea. The lowest clouds are misty fogs that form right on the ground, or sitting on the ocean