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35 Cards in this Set
- Front
- Back
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Define atmosphere.
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a thin blanket of gases and dust particles surrounding the earth
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Define air pressure.
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the weight of the air
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Define altitude.
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the measurement of the distance above sea level
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Define weather.
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the condition of the atmosphere at any moment in time
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List the 3 main gases that make up the air.
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nitrogen, oxygen, carbon dioxide
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What holds the atmosphere close to the surface?
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gravity
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What instrument measures air pressure?
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barometer
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List three benefits we gain from the atmosphere.
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air to breathe, protects the earth, and controls the climate
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What is the second layer of the atmosphere
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stratosphere
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In which layer of the atmosphere does weather occur?
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troposphere
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What type of winds are influenced by changes in temperature in a small area?
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local winds
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What do we call the boundary where two different air masses meet?
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a front
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What is the name for a body of air that has about the same temperature and moisture?
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an air mass
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Which winds move in large, circular belts around the earth?
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global winds
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What do we call moving air?
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wind
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A dense or high pressure air mass is usually made of what kind of air?
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cool, dry air
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A light or low pressure air mass is usually made of what kind of air?
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warm, moist air
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What instrument shows the direction wind is blowing?
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a wind vane
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What instrument is used to measure wind speed?
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an anemometer
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What causes wind to form?
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changes in temperature
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How is wind formed as the temperature changes?
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Cooler air moves to replace the rising warmer air.
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Moisture that falls from the atmosphere to the ground is called ____________________.
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precipitation
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What is humidity?
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water vapor in the atmosphere
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What are clouds made of?
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condensed water vapor or ice crystals
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What do we call rain that freezes on the way down into tiny ice pellets?
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sleet
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What are ice crystals that join together in clouds and fall to earth called?
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snow
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What type of precipitation is made up of layers of ice from being repeatedly blown back up into the cloud from which it falls?
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hail
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Are dew and frost precipitation?
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No because they do not fall from the sky.
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Which word is always attached to a cloud that produces rain?
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nimbus
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What is created from air vibrations caused by rapid heating of the air?
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thunder
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What is static electricity that moves between clouds?
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lightning
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What is a storm that forms over the ocean with spiraling winds, usually in the Atlantic or eastern Pacific Ocean?
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a hurricane
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What do we call a snowstorm with freezing winds and blowing snow?
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a blizzard
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What does a weather warning mean?
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the storm has begun-take cover
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What does a weather watch mean?
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Conditions are favorable for a storm, but none have yet been seen.
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