Nancy Beth Gardner and Judy Beaulac, age 10  for their question:

What are the troposphere and stratosphere?

We live in the downstairs floor of the atmosphere, The air is dense and teeming with good oxygen. It blows and swirls around, making the restless weather. For that reason it is called the troposphere, the turning sphere. The air in this downstairs layer gets cooler with every mile above the earth.

Then comes a sudden change. About seven miles above out heads, the air stops cooling off. In fact, it may become a little warmer. It has reached the upstairs stratosphere, Up there, the swirling weather calms down,.

The floor of the stratosphere is not the same height all over the world,, It is highest over the equator. There the upstairs floor is about ten and a half miles above the earth. The floor slopes gradually lower towards the poles, There it is only four to five miles above the earth. This means that five miles ups the air is warmer over the poles than it is over the equator