The goal of this unit is for students to understand how the sun effects the Earth both positively and negatively. This can be achieved by students reflecting on what they have learned. To begin the unit, ask the students, "How does the sun effect you?" and record their responses. As a class, discuss what they know about the sun and how it can effect us positively and negatively. On one piece of chart paper write "Earth's Friend" and on a second piece of chart paper write "Earth's Foe". Discuss what these terms mean. Throughout the unit as each of the different topics are discussed, conclude the section by adding information to the appropriate category. For example, after discussing the effects of UV rays on humans, have the students discuss if the effects are positive, negative, or both. Record the information on the chart paper. Upon closure of the unit students can discuss or write their findings based on their continuous reflection.