| A | B |
|---|
| Core | Central region where fusion occurs; about 400,000 km in diameter |
| Radiation zone | region of highly compressed gas around the core; about 300,000 km thick |
| Convection zone | The outer layer of the sun's interior |
| Photosphere | Innermost layer of the Sun's atmosphere; about 500 km thick. |
| Chromosphere | Middle layer of the Sun's atmosphere |
| Corona | Outermost layer of the Sun's atmosphere |
| Sunspots | Areas of gas in the photosphere that are cooler than surrounding gases. |
| Prominences | Huge loops of gas that erupt from sunspots |
| Solar flare | Sudden eruption of enery from the Sun producing x-rays and high speed charged particles |
