| A | B |
|---|
| air pressure | the force of air molecules pushing on an area |
| barometer | instrument that measures air pressure |
| weather | condition of Earth's atmosphere at a particular time and place |
| climate | the general, average weather conditions in an area over a long period of time |
| global winds | travel thousands of miles in steady patterns |
| Coriolis effect | the influence of Earth's rotation |
| jet streams | flow in the upper troposphere from west to east |
| local wimds | blow within a small area |
| monsoons | winds that change direction with the seasons |
| evaporation | liquid to gas |
| condensation | gas to liquid |
| precipitation | any type of water falling to Earth's surface |
| wind | air that moves horizontally |
| humidity | amount of water vapor in the air |
| relative humidity | compares the amount of water vapor in air with the max amount of water vapor that can be present at that temperature |
| air mass | large volume of air in which temperature and humidity are nearly the same throughout |
| acid rain | rain that is more acidic due to pollution |
| front | boundary between air masses |
| high pressure | usually means good weather |
| low pressure | usually means bad weather |
| tropical storm | low pressure system with winds 40 mph or more |
| hurricane | tropical low pressure system with winds at least 74 mph |
| storm surge | flooding caused by hurricanes |
| blizzard | blinding snowstorm with winds of at least 35 mph |
| thunderstorm | storm with lightning and thunder |
| tornado | violently rotating column of air stretching from a cloud to the ground |
| meteorologist | scientist who studies the weather |
| hygrometer | measures watervapor content of the air |
| weather vane | indicates wind direction |
| thermometer | measures temperature |
