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5 Science Chapter 8
| Term | Definition |
|---|---|
| 1,000 miles per hour | the rate the earth's surface spins |
| earth's axis | different seasons are caused by the tilt of this |
| axis | the imaginary line running through the earth from North Pole to South Pole |
| meteorologists | scientists who study the weather |
| warm air | lighter than cool air and rises |
| ground | the air that we live is receives most of its warmth from here |
| winds | produces by temperature differences on the earth |
| sun | basic cause of all weather |
| 100% | air is saturated when the humidity of the air is at this percent |
| dew point | the lowest possible temperature at which air is able to hold all of its water vapor |
| frost | water vapor that condenses and forms frozen water on the ground |
| condensation | process in which water vapor leaves the air and changes into liquid water |
| relative humidity | amount of water that the air can hold at a given temperature |
| freezing rain | falling ice crystals melt, hit the earth as liquid rain, but refreeze as soon as they land |
| rain | an ice crystal in a cloud becomes too heavy, falls, melts, and lands on the earth as liquid water |
| wet snow | falling ice crystals melt slightly, stick, and freeze together into snowflakes |
| dew | water vapor that condenses to form liquid water on the ground |
| hail | a small piece of ice is tossed up and down inside a cloud, forming several layers of ice, until it is too heavy and falls to earth |
| sleet | falling ice crystals melt into raindrops, then refreeze and land on earth as tiny pieces of ice |
| nimbus | term used to describe a cloud from which rain is falling |
| stratus family | layers of flat clouds |
| cirrus family | wispy, curly clouds very high in the atmosphere |
| cumulonimbus cloud | also known as "thunderhead" |
| stratus clouds | sheets of clouds that often produce rain |
| cumulus family | puffy, bulgy clouds |
| cirrus clouds | clouds made of very small ice crystals |
| thunder | rapid expansion of superheated air causes shock waves that we hear |
| eye | the calm region of very low air pressure in the center of a tornado |
| sheet lightning | lightning bolts that do not come in contact with the ground but remain within the cloud |
| tornado warning | issued when meteorologists have spotted a tornado |
| front | boundary between two air masses |
| lightning | produced when opposite electrical charges build up in very tall clouds |
| step leader | thin channel of charged air through which a lightning bolt can travel |
| squall line | the row of thunderheads that builds up in the front of advancing cold air |
| anvil top | broad, flat top of a cumulonimbus cloud |
| tornado | type of storm that packs the most destructive power into the smallest space |
Created by:
Mrs_CC
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