| A | B |
|---|
| temperature | the measure of the amount of motion of molecules |
| condensation | when water changes from a gas to a liquid |
| evaporation | when water changes from a liquid to a gas |
| precipitation | any form of water falling from the sky |
| water cycle | water is constantly cycling through the hydrosphere and the atmosphere |
| dew point | the temperature at which air is saturated and condensation forms |
| frost | what happens to dew when the temperature drops below freezing |
| clouds | these form as warm moist air is forced upward, it expands, and then cools |
| stratus | fog is this type of cloud |
| cumulus | fluffy white clouds with flat bases |
| cirrus | these clouds are made from ice crystals, and are thin feathery and white |
| nimbus | dark rain clouds |
| cumulonimbus | these clouds produce thunderstorms |
| sun | energy from this causes water to heat up and evaporate |
| air temperature | determines what type of precipitation forms |
| snow | this forms when water vapor turns directly into a solid |
| air mass | a large body of air that is similar to the land it has formed ov er |
| stormy | low pressures bring what type of weather |
| front | the boundary between two air masses |
| blue triangles | a cold front is represented by this |
| red semicircles | a warm front is represented by this |
| meteorologist | a person who studies the weather |
| station model | shows the weather conditions at a specific place and time |
| ten knots | one barb represents how much wind speed? |
| five knots | 1/2 a barb represents this much wind speed |
| barometer | instrument used to measure air pressure |
| tornadoes | these are produced by severe thunderstorms |
| hurricane | the most powerful storm |
| isotherms | lines that connect points of equal temperature |
| isobars | lines that connect points of equal atmospheric pressure |
