| Answer | Crossword Clue |
|---|---|
| phosphorescence | Light emitted by a substance without combustion or perceptible heat |
| conduction | The process by which heat or electricity is directly transmitted through a substance when there is a difference of temperature or of electrical potential between adjoining regions, without movement of the material |
| reflection | The throwing back by a body or surface of light, heat, or sound without absorbing it |
| reflections | The throwing back by a body or surface of light, heat, or sound without absorbing it |
