| A | B |
|---|
| hydroelectric | energy from water |
| hydrant | used by fire fighters |
| dehydrated | something that is dried out |
| hydrogen | an element and a gas |
| hydrophobia | fear of water |
| synchronize | to happen at same time |
| chronic | occuring regularly |
| chronological | by age or date in order |
| chronicle | historical record of events |
| thermometer | instrument to measure temperature |
| thermal | a type of heat |
| thermostat | regulates temperature |
| thermos | instrument which holds hot liquids |
| barometer | measures pressure, relates to weather |
| centimeter | one hundredth of a meter |
| diameter | divides a circle in half |
| symmetry | balanced proportions |
| geometry | branch of math that deals with lines and shapes |
| speedometer | instrument that measures speed |
| hydraulic | operated by means of water |
| metronome | tool used in music to keep beat |
| thermodynamic | physics that deals with heat |
| asymmetrical | not symmetrical |
| chronograph | an instrument for measuring time intervals |
| thermonuclear | heat reactions that take place in atoms |
