The Sun and Other StarsDirections: On the line before each definition, write the letter of the term that matches it correctly. Each term isused only once.1.shell of cooler hydrogen above a star’s core2.sudden increases of brightness caused by violenteruptions on the Sun3.elements, including helium and hydrogen gas, that make up a star4.orange-red layer above the photosphere5.appear as dark splotches on the Sun6.occurs when the nuclei of several atoms combineinto one larger nucleus7.two stars that orbit each other8.apparent surface of a star9.charged particles that stream away from the Sun10.large ball of gas held together by gravity with anextremely hot core11.zone above the radiative zone in which hot gasmoves toward the surface12.wide outermost layer of a star’s atmosphereA. nuclear fusionB. stellar compositionC. starD. radiative zoneE. convection zoneF. photosphereG. chromosphereH. coronaI. sunspotsJ. solar flaresK. solar windL. binary star systemStars and Galaxies33Content Practice A Name Date Class LESSON 2The Sun and Other StarsKey Concept How are stars layered?Directions:Use the diagram to respond to each statement on the linesprovided.1.This layer of the Sun is a shell of coolerhydrogen above a star’score. 2.Over time, hydrogen in this layer ofthe Sun fuses into more complexnuclei. 3.This wide, outermost layer of the Sunhas an irregular shape and a temperaturehigher than the chromosphere.4.This layer of the Sun is above thestar’s core and contains cooler and less-dense hydrogen. 5.In this interior layer of the Sun, hot gas moves up toward the surface and coolergas moves deeper into the interior. 6.Immediately above the photosphere of the Sun is this orange-red layer.7.This atmospheric gas layer of the Sun is the apparent surface of a star. It is the dense, bright part you can see. 8.Stars fuse hydrogen into helium. The denser helium sinks to theinner part of this layerof the Sun.