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40 Cards in this Set
- Front
- Back
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The primary cause of weather is due to _____________ in temperature around the Earth.
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differences
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The four major factors affecting weather are:
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temperature
wind pressure moisture |
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The ultimate source of energy for weather is the what?
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sun
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Nearly all weather occurs in the layer of atmosphere called the ________
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troposphere
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The troposphere receives most of its heat energy from the _______
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ground
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The warmest part of the troposphere is usually the ___
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bottom
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The part of the Earth which receives the least solar radiation is the _____.
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poles
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Two standard scales for measuring temperature are:
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Celsius and Fahrenheit
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Temperature is a measure of the amount of heat energy in an object.
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false
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Water freezes at __ degrees Celsius
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0
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Water boils at _____ degrees Fahrenheit
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212
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Water freezes at ____ degrees F
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32
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Water boils at ____ degrees C
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100
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Local winds can be caused by ________ heating of the earth's surface.
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uneven
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What three things happen when air is warmed?
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it expands
it becomes lighter it rises |
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Cold air is more dense than warm air.
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true
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When warm air rises, cold air will _____.
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sink and fill in the space
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When standing on the beach and facing the ocean at night, the wind will usually be at your _____.
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back
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An instrument used to measure wind speed is called an anemometer
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true
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The overall global circulation of air is caused by rising equatorial air, sinking
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true
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The tendency of winds to curve (deflect) is the result of the coriolis effect
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true
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Wind moving in the Southern Hemisphere will change direction to the left.
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true
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A narrow band of high-velocity air in the upper troposphere is called the jet stream
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true
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The jet stream flows from east to west across the United States and Europe.
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false
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The trade winds are located about ___ degrees north and south of the equator.
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30
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Standard sea level pressure is about _____ lb/in 2 (pounds per square inch).
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15
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Low pressure areas will rotate counterclockwise and usually have stormy weather
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true
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Areas of sinking cold air generally have high pressure and fair weather
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true
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Air always moves from high to low pressure
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true
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As you descend through the atmosphere in an aircraft, what would you expect the outside pressure and temperature to do?
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increase/increase
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The measure of water vapor saturation of air is called ________ _________
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relative humidity
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Cold air can hold more moisture than warm air.
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false
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Relative humidity changes with temperature.
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true
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Clouds are made of dense water vapor.
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false
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The temperature at which air becomes saturated with water vapor is called the dew point
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true
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When air is saturated, the relative humidity is ____ %
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100
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When air is cooled, the relative humidity will _____.
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increase
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Clouds form when the air is cooled below the ____ _________
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dew point
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Condensation nuclei are needed for the formation of:
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clouds
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When water vapor freezes directly into ice crystals, ______ is formed
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snow
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