Fourth Grade
Worksheets
It Glows in the Dark!
Noah climbed into his bed. He turned out the light. The glow-in-the-dark stars on his ceiling began to glow. The dinosaur on his pajama shirt lit up in the dark. The planets on his solar system mobile glowed as it floated in the air. The glow-in-the-dark necklace that he got at the baseball game that night glowed as it sat on his desk. There was so much light in his dark room. How was that possible?
When the lights go out, glow-in-the-dark things show their true colors. They have to be charged to work. They cannot be plugged into an outlet. They do not have batteries that make them work. Instead they contain phosphors. A phosphor is something that makes light that can be seen. It has to be energized. Once it is energized it glows or gives off light.
So what energizes .....
