Chapter 29 - The Sun

2. The outermost layer of the Sun’s atmosphere; visible during a total solar eclipse.
5. A dark, cooler area on the Sun’s surface caused by magnetic activity.
6. Light displays near Earth’s poles caused by charged particles from the Sun interacting with Earth’s atmosphere.
12. A stream of charged particles flowing outward from the Sun in all directions.
13. The visible surface of the Sun that gives off most of its light.
14. The period during the solar cycle when sunspot activity is highest.
15. The star at the center of our solar system that provides Earth with light and heat.
16. The outer layer of the Sun’s interior where energy is transferred by convection currents.
18. The element produced when hydrogen undergoes nuclear fusion in the Sun.
19. A sudden explosion of energy on the Sun’s surface that releases radiation and charged particles.
20. A large, bright loop of gas extending outward from the Sun’s surface.
21. The period during the solar cycle when sunspot activity is lowest.

1. The central region of the Sun where nuclear fusion occurs.
3. The average distance from Earth to the Sun (about 150 million kilometers or 93 million miles).
4. The range of all types of electromagnetic radiation, including visible light, ultraviolet, and X-rays.
7. The layer of the Sun where energy moves outward mainly by radiation.
8. The main element in the Sun and the fuel for nuclear fusion.
9. A thin layer of the Sun’s atmosphere above the photosphere that appears reddish during a solar eclipse.
10. The region around the Sun where magnetic forces act.
11. The approximately 11-year cycle in which the number of sunspots increases and decreases.
17. The process by which hydrogen atoms combine to form helium in the Sun’s core, releasing energy.