the atmosphere be classified might a thin layer around earth
The temperature and air pressures.
Based on temperature differences.
you might make an incorrect identification
Lifeless, more like Mars
The atmosphere and particles of the evaporating water mixes in with the particles use to make oxygen what we all now oxygen. THIS IS MY SUGGESTION. ( I MIGHT BE WRONG AND I MIGHT BE RIGHT ).
Clouds are classified by the height of which they are at, in the Earths atmosphere.
The atmosphere isn't classified as one layer. It is because different layers have different gases.
Atmosphere Biosphere, Hydrosphere, Lithosphere
Clouds are formed by when tiny droplets of vapor form together.Clouds are classified by how high up in the atmosphere they occur.
CO2, H2O, methane.
The temperature and air pressures.
A space rock is classified as a meteoroid when it enters Earth's atmosphere and has not yet ignited. It is classified as a meteorite when it hits Earth's surface.
Based on temperature differences.
Cyanobacteria
Mercury barely has an atmosphere at all. So little that it might as well have no atmosphere.
aspen
The color depends on where, when, how and with what you are looking at the atmosphere. For example, astronaut might see it as "clear" but people watching a sunset might see it as more orange/red.