| A | B |
|---|
| Food energy | Living things convert this into motion & heat |
| Fuels | Materials that store energy |
| Energy conversion | When energy changes from one form to another |
| Sun | Source of most energy on Earth |
| Echo | Created when sound waves hit an object & bounce back toward their source |
| Medium | Solids, liquids, & gases |
| Amplitude | the height of a sound wave |
| Wavelength | The distance from one highest point on a sound wave to the next |
| Oscilloscope | Machine that creates an image of sound |
| Hertz | The unit scientists use to measure the frequency of sound |
| Pitch | How high or low a sound is |
| Slow vibrations = | Lower pitch |
| Faster vibrations = | Higher pitch |
| More molecules = | Sound travels faster |
| Less molecules = | Sound travels slower |
| Warmer medium = | Sound travels faster |
| Cooler medium = | Sound travels slower |
| The Sun's energy comes in 2 forms: | Light & heat |
