What causes wind in Earth's atmosphere?

How many main layers does Earth's atmosphere have?

Which layer of the atmosphere do most airplanes fly in?

What color does the sky appear to be due to a process called?

What gas do plants take in from the atmosphere during photosynthesis?

In which layer of the atmosphere do most weather phenomena occur?

What protective layer in the atmosphere blocks harmful UV radiation?

What is the average temperature at Earth's surface?

Which gas makes up about 21% of Earth's atmosphere?

What phenomenon causes the colorful lights known as auroras?

How many kilometers thick is the troposphere at the equator?

What percentage of Earth's atmosphere is argon?

Which layer of the atmosphere contains the ozone layer?

What percentage of Earth's atmosphere is made up of nitrogen?

Which gas is most responsible for the greenhouse effect?

At what altitude does space officially begin?

What is the main gas responsible for the blue color of the sky?

Which atmospheric layer contains most of Earth's water vapor?

What percentage of the atmosphere is made up of rare gases like neon and helium?

How many kilometers up does the atmosphere extend before fading into space?