What is the air we breathe made up of? what is the most common element in it? why is air consider a mixture?

It is made up of about 78% nitrogen, 21% oxygen, and many other elements like argon, water vapor, and other things. The most common element of air is nitrogen, and it is considered a mixture because we can distinguish between the elements in the air we breath, and we can physically separate the elements in the air.

the aurora is formed when charged particles emitted from the sun during a solar flare penetrate the earth's magnetic shield and collide with atoms and molecules in our atmosphere. these collisions result in countless little bursts of light, called photons, which make up the aurora.

auroras are generated by charged solar particles hitting molecules in earth's atmosphere. this usually happens in high latitudes, because our planet’s magnetic field tends to funnel these particles toward the poles. that’s why it can be experienced in northern ohio.