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weather unit vocab
| Term | Definition |
|---|---|
| Map | a flat, 2 dimensional drawing of land and water |
| Globe | A spherical scale model of the earth |
| latitude | Geographic coordinate that specifies the north or south of the equator |
| longitude | Distance measured in degrees east or west from an imaginary line (called the prime meridian) that goes from the north pole to the south pole |
| Hemisphere | A half of the earth ,usually divided into northern and southern halves by the equator or the west and east halves by an imaginary line passing through the poles |
| weather | the state of the atmosphere at a place and time as regards heat ,dryness,sunshine wind and precipitation |
| climate | the average weather conditions in an area over a long period |
| Atmosphere | the envelope of gasses surrounding the earth |
| cirrus | white wispy clouds that form at high altitude and are always made of ice crystals |
| cumulus | fair weather clouds with white puffy tops and dark flat bottoms |
| stratus | lowest clouds that cover the sky like a thick blanket |
| Nimbus/Nimbo | Precipitating cloud ,such as a nimbostratus or a cumulonimbus |
| cumulonimbus | a huge vertical cloud that can produce a thunderstorm |
| Land breeze | A breeze blowing toward the sea from the land ,especially at day because the land is warmer than the sea |
| sea breeze | A breeze blowing toward the land from the sea ,especially at night because the sea is warmer than the land |
| Percipitation | water that falls to the earths surface as rain.snow,sleet or hail |
| Evaporation | The process of changing from liquid to gas |
| condensation | The process of changing from gas to liquid |
| jet stream | a steady world wide wind that blows from west to east high above earth |
| Gulf stream | a warm current that starts near the equator and moves from Florida a all the way to Iceland |
| Air mass | a large"bubble" of air that has about the same temperature or humidity around it |
| La Nina/EL Nino | unusual warming or cooling of the seawater in pacific ocean |
| Temperature | the average speed of the particles in a substance |
| Air pressure | the weight of the air pushing on everything around it |
| humidity | water vapor in the air |
| Thermometer | a tool that measures temperature |
| Barometer | A weather that measures air pressure |
| Anemometer | A weather instrument that measures wind speed |
| wind vane | A weather instrument that shows the direction the wind is coming from |
| Rain guage | a weather instrument that measures rainfall |
| Front | A place one air mass meets and pushes aside another air mass |
| Hurricane | A very large and violent tropical storm |
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