Exploring the Layers of Earth's Atmosphere

What analogy is used to explain the concept of air on Earth?

What percentage of the air is made up of oxygen?

Which gas makes up the largest portion of the Earth's atmosphere?

What is the topmost layer of the atmosphere called?

In which layer do satellites fly?

Where do hot air balloons typically fly?

Which layer of the atmosphere is closest to the Earth's surface?

Where do airplanes typically fly?

How does air pressure change as you go higher in the atmosphere?

Why does heavier air settle at the bottom of the atmosphere?