What is the atmospheric layer that is closest to Earth's surface?
What layer of the atmosphere has the aurora borealis in it?
What layer has the ozone layer in it?
What does the ozone layer do?
What layer protects us by burning up most meteors?
What layer does most weather occur in?
What is the most common gas in the atmosphere?
What gas makes up around 21% of our atmosphere?
What is the aurora borealis most commonly called
What is an atmosphere?