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Across 1. Light or sound energy cannot travel in space. 5. A closed path through which electricity flows is called a _______. 7. Both light and sound travel in _____. 8. Vibrations are the source of this energy. 9. A toaster converts ________ energy into heat energy. 11. Light can be ________. absorbed or transmitted. 13. Sound travels through all phases of ________. 15. A curved piece of glass that refracts light to improve vision is called a _____. 17. Light or sound energy can travel in space.

Down 2. The type of material that lets no light through is called ________. 3. Sound moves faster through solids, liquids or gases. 4. Magnets are ________ when opposite poles are put together. 6. When we look at a blue shirt, what color is being reflected? 8. Energy from the sun is called ______. 10. When water is being heated on a stove, electrical energy is converted to ____ energy. 11. When a light ray passes through an object, it can bend or ________. 12. Another word for heat is ________. 14. A candle gives off both light energy and _______ energy. 16. Almost all of the energy on Earth comes from the _______.