Question 21
Match each statement in Column A to a letter in Column B. Each letter may be used once or not at all. (2 points)
Column A:
**1.** The process by which the Sun produces energy.
**2.** The main elements composing the Sun.
**3.** The galaxy containing the Solar System.
**4.** A Solar System member that can be seen periodically.
Column B: A. nuclear fission; B. nuclear fusion; C. oxygen and nitrogen; D. hydrogen and helium; E. Milky Way; F. comet; G. solar eclipse; H. lunar eclipse; I. asteroids.
Column A:
**1.** The process by which the Sun produces energy.
**2.** The main elements composing the Sun.
**3.** The galaxy containing the Solar System.
**4.** A Solar System member that can be seen periodically.
Column B: A. nuclear fission; B. nuclear fusion; C. oxygen and nitrogen; D. hydrogen and helium; E. Milky Way; F. comet; G. solar eclipse; H. lunar eclipse; I. asteroids.