The Sun's "atmosphere": the photosphere, the chromosphere, and the corona.
Describe what can be observed from each layer and what each is revealing about the Sun.
Photosphere: texture, surface, sunspots
Chromosphere: flares, promeneces, like the first layer of Earth's atmosphere
Corona: hot, high energy, low density, like the Earth's magnetic field
They reveal the emission of energy, the level of energy and where the Sun is in its cycle.