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28 Cards in this Set
- Front
- Back
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Weather refers to the state of the ____________________ at a specific ________ and __________.
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Atmosphere, time, place
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Name four conditions of the atmosphere that weather usually describes.
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Temperature, air pressure, humidity (amount of moisture in the air), wind
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What two effects does the Sun’s energy have on Earth’s weather?
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Heating and drying (evaporation)
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Weather results from what 3 elements?
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Heat, Earth’s air, Earth’s water
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A measure of the average amount of motion of molecules is called ______ ______________________.
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Air temperature
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Air moving in a specific direction is called ________.
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Wind
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The amount of water vapor in the air is called ________________.
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Humidity
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How does tempoerature of air affect movement of molecules?
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When the temperature is high, molecules move rapidly; when the temperature is low; molecules move less rapdly.
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Wind results because air moves from areas of ________ pressure to ______ pressure.
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High, low
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Name three wind-measuring instruments and tell what they are used to measure:.
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Wind vane - direction
Wind sock - direction Anenometer - Wind speed |
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When heat evaporates water into the air, where does it go?
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Water vapor molecules are formed that fill up the spaces among air molecules.
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Why is there generally more water vapor present when air is warm than when it is cool?
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The quicker movement of air molecules at higher temperatures keep the molecules of water vapor from coming together and forming droplets of water.
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When water vapor becomes liquid, what is that process called?
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Condensation
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When enough water vapor is present in air for condensation to take place, the air is __________________.
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Saturated
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Hailstones are ______________ of ice that form inside a __________.
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pellets,cloud
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What is precipitation?
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water falling from clouds
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When the air is cold, water vapor forms ____________________.
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snowflakes
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What do cumulus clouds look like?
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masses of puffy, white clouds often with flat bases
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What do cirrus clouds look like?
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fibrous or curly
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When the relative humity reaches 100 percent, the air is saturated which causes the __________ __________ to condense in tiny droplets around small particles such as ________ and ________.
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Water vapor, dust, salt
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How are clouds classified?
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shape and height
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What cloud does hail precipitate from?
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cumulonimbus
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What are the four main types of precipitation?
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rain, snow, sleet and hail
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When air is cooled to its dew point near the ground, it forms a stratus cloud called ______.
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fog
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What is humidity?
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the amount of water vapor present in the air
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Relative humidity is the amount of __________ __________ present in the air compared to the amount needed for ____________________ at a specific temperature.
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water vapor, saturation
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When the air near the ground is cold, __________ falls, which is made up of many small ice pellets.
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sleet
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The main types of clouds are ______________, ______________, and ____________.
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stratus, cumulus, cirrus
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