NATIONAL STANDARDS: National Science Standards, Grades K-4- Physical Science: II. Content Standard B- Light travels in a straight line until it strikes an object. Light can be reflected by a mirror, refracted by a lens, or absorbed by the object.- Heat can be produced in many ways; heat can move from one object to another by conduction- Earth and Space Science: IV. Content Standard D- The sun provides the light and heat necessary to maintain the temperature of the earth.