| A | B |
|---|
| air pressure | force that is the result of the weight of a column of air pushing down on an area |
| anemometer | an instrument used to measure wind speed |
| atmosphere | the layer of gases that surrounds the earth |
| aurora borealis | northern lights |
| barometer | an instrument used to measure changes in air pressure |
| cirrus | wispy clouds, above 6 km (high) |
| condensation | process by which water vapor turns into a liquid |
| Coriolis effect | the way Earth's rotation makes winds curve |
| cumulus | clouds that fomr less than 2 km above ground, large fluffy |
| dew point | the temperature at which condensation begins |
| drought | long period of low precipitation |
| evaporation | water molecules turning from a liquid into a gas (water vapor) |
| exosphere | outer layer of the atmosphere |
| front | area where air masses meet and do not mix |
| global winds | winds that blow over long distances |
| local winds | winds that blow over short distances |
| humidity | amount of water vapor in the air |
| jet stream | bands of high-speed winds about 10 km above Earth's surface |
| land breeze | flow of air from land to water |
| sea breeze | flow of air from water to land |
| monsoon | sea and land breezes over a large region that change direction with the seasons |
| ozone | a form of oxygen that has three oxygen atoms instead of two |
| occluded front | cut off |
| precipitation | any form of water that falls from clouds, |
| psychrometer | instrument used to measure relative humidity |
| rain gauge | instrument used to measure rainfall |
| relative humidity | amount of moisture in the air compared to how much the air can hold (percentage) |
| storm | violent disturbance in the atmosphere |
| stratus | clouds that form in layers |
| thermometer | instrument used to measure temperature |
| water vapor | water in the form of a gas |
| wind | the horizontal movement of air from an area of high pressure to an area of lower pressure |
| wind-chill factor | increased cooling caused by the wind |
