| A | B |
|---|
| core | where nuclear fusion takes place |
| nuclear fusion | hydrogen atoms join together in this process to form helium |
| radiation zone | a region of tightly packed gas where energy is transferred mainly in the |
| convection zone | cooling and heating loops of gas move energy in this outermost layer of the sun's interior |
| photosphere | innermost layer of sun's atmosphere--gives off visible light |
| chromosphere | middle layer of sun's atmosphere--the color sphere |
| corona | outer layer of sun's atmosphere--like a halo |
| solar wind | stream of electrically charge particles that come from the corona |
| sunspot | dark area of gas on sun's surface that is cooler than surrounding gases |
| prominence | huge, reddish loop of gas that protrudes from the sun's surface linking parts of sunspot regions |
| solar flare | eruption of gas from the sun's surface that occurs when loops ins unspot regions suddenly connect |
| convection zone, radiation zone, core | three layers of sun's interior |
| corona, chromosphere, photosphere | three layers of sun's atmosphere |
| sunspots, prominences, solar flares | these features form on or about the sun's surface |
