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Chapter 21

Study Guide 2013

What is weather? state of the atmosphere at a specific time and place
What causes Earth's weather? the sun
Air coming from over land is (moist/dry) and is called (Continental/Polar)? dry, Continental
Air coming from over ocean (moist/dry) and is called (Continental/Polar)? moist, Maritime
Air from the North is (cold/warm) and is called (Polar/Tropical)? cold, Polar
Air from the South is (cold/warm) and is called (Polar/Tropical)? warm, Tropical
What is a FRONT? a boundary between two air masses of different density, moisture or temp
What is a COLD FRONT? cold air advances toward warm air (blue, pointy on same side of line on a map)
What is a WARM FRONT? lighter warm air advances over heavier colder air (red, rounded on same side of line on a map)
What is an OCCLUDED FRONT? cold air moves toward cool air with warm air in between (purple, rounded and pointy on same side of line on a map)
What is a STATIONARY FRONT? boundary between air masses that is not moving (blue, pointy on one side; red, rounded on other side of line on a map)
What kind of weather at Low Pressure areas? cloudy because air rises when pressure is low and clouds form when air is lifted and cools
What kind of weather at High Pressure areas? good weather because high pressure makes air sink making it difficult for air to rise, cool, condense and form clouds
What causes thunder? lightning that superheats the air, causing it to expand quickly and clasp back together
How does a thunderstorm form? warm, humid air rises rapidly within a cumulonimbus cloud
How is lightning created? air moves inside storm clouds causing opposite charges
How is a hurricane classified? by wind speed
In order to be called a hurricane the wind speed must be at least ____ mph. 74 mph
Hurricanes need _____ and _____ from warm ocean water to gain strength. heat and moisture
What is the name of a person who studies weather? Meteorologist
What is the difference in an isoTHERM and an isoBAR? ISOTHERM connects points of equal TEMPERATURE on a map; ISOBAR connects points of equal PRESSURE
The closer the isobars, the (faster/slower)the wind speed? faster
Wind direction is determined by the direction the wind is (going/coming from). coming from
What instrument measures wind direction? wind vanes
What instrument measures wind speed? anemometer
What instrument measures air pressure? barometer
What instrument measures relative humidity? sling psychrometer
Wind blows from (high/low) pressure to (high/low) pressure. from high to low
Wind coming from the polar regions (poles) is called ____ and has ______ temperatures. Polar, cold
Wind coming from the equitorial regions (equator) is called ____ and has ____ temperatures. Tropical, warm
Air coming from over the ocean is (moist/dry) and is called ________. moist, Maritime
Air coming from over land is (moist/dry) and is called _____. dry, Continental
Air coming from the north over Canada is called _____? Continental Polar
Air coming from south, moving over the ocean is called ______? Maritime Tropical
What is on a map that shows the weather conditions at a specific location? station model
Created by: ebegley
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