Use Each of the Terms Below Just Once to Complete the Passage

Name ______Date______Hour______

29.1 The Sun

Use each of the terms below just once to complete the passage. chromosphere corona gaseous ions mass photosphere solar eclipse solar system solar wind

The Sun is the largest object in our (1) ______. Its (2)______controls the motions of the planets. The center of the Sun is very dense. The high temperature at its center causes the solar interior to be (3) ______throughout. The visible surface of the Sun is called the (4) ______. It is the lowest layer of the Sun and is approximately 400km (249mi) in thickness. The average temperature is 5,800°K (9,980°F). Above the visible layer is the (5) ______. It is approximately 2,500km (1,553mi) thick and has a temperature of nearly 30,000°K (53,540°K) at the top. Without special filters, this layer is visible only during a (6) ______. The top layer of the Sun’s atmosphere is the (7) ______. It has a temperature range of 1 million to 2 million °K (1,799,540°F to 3,599,540°F). Gas flows outward from this layer at high speeds and forms the (8) ______. It is made up of charged particles, or (9) ______, which flow outward through the entire solar system.

Match the terms in column B to the correct meaning in column A. Answe Column A Column B r  10. Cooler areas on the surfaces of the photosphere a. Prominence that appear darker than the surrounding areas on the Sun 11. A period of 22.4 years in which the number of b. Solar flares sunspots on the Sun changes regularly and the Sun’s magnetic field reverses. 12. Violent eruptions of particles and radiation from c. the surface of the Sun. Sunspots 13. Arc of gas ejected from the photosphere d. Solar activity cycle

14. What is fusion? Where does it take place in the Sun? ______15. What is the process that transfers the Sun’s energy from particle to particle? Where does this process take place? ______16. How far, as a percentage, does the radiative zone extend to the photosphere? ______17. What is the process that carries the Sun’s energy the rest of the way to the Sun’s surface? What carries the energy? ______

Label each layer of the Sun using the following terms. convective zone radiative zone core