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40 Cards in this Set

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