| A | B |
|---|
| energy | the ability to cause change |
| potential energy | energy at rest (rock at top of hill) |
| kinetic energy | energy of motion (rock rolling down hill) |
| light and heat | two forms of energy that the sun gives off |
| sun | almost all of the Earth's energy comes from this |
| fossil fuels | coal and oil are examples: made from dead organisms (plants & animals) pressed together over millions of years |
| batteries | these contain stored energy and are used in flashlights |
| food | what a human body needs for energy |
| stored energy | energy that can be used later |
| light travels | up and down waves |
| sound travels | back and forth waves |
| vibrate | move back and forth quickly |
| circuit | path electricity follows from the battery through the bulb, and back again |
