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Science - Chapter 9 Vocab
Earth's Weather
23
Science
4th Grade
02/21/2012

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Term
humidity
Definition
a measurement of how much water vapor is in the air
Term
air pressure
Definition
the force put on a given area by the weight of the air above it
Term
stratus cloud
Definition
cloud w/ blanket-like layer
Term
cumulus cloud
Definition
puffy cloud; appears to rise from a flat bottom
Term
cirrus cloud
Definition
clouds w/ a wispy, feather-like shape; made of ice crystals
Term
Name the 4 layers of the atmosphere from lowest to highest
Definition
4. troposphere 3. stratosphere 2. mesosphere 1. thermosphere
Term
What sentence will help you memorize the layers of the atmos.? (mnemonic device)
Definition
The Snake Made Tea in a Hurry
Term
hygrometer
Definition
measures humidity
Term
thermometer
Definition
measures air temp.
Term
weather vane
Definition
measures wind direction
Term
anemometer
Definition
measures wind speed
Term
barometer
Definition
measures air pressure
Term
rain gauge
Definition
measures amt. of rain that's fallen
Term
air mass
Definition
a large region of the atmos. where the air has similar properties throughout
Term
front
Definition
a boundary between air masses w/ dif. temps
Term
warm front
Definition
warm air mass slide up and over cold air mass
Term
cold front
Definition
cold air moves in under a warm air mass
Term
stationary front
Definition
an unmoving front where a cold air mass meets a warm air mass
Term
storms
Definition
air masses w/ big differences in temp, humidity, and air pressure meet
Term
thunderstorms
Definition
warm air rises and cools quickly, producing lightning and rain
Term
hurricanes
Definition
begin from warm, moist air masses above warm ocean waters
Term
tornadoes
Definition
begin when air masses w/ big temp. differences meet
Term
the 4 ingredients of weather
Definition
1. air temp 2. humidity 3. air pressure 4. wind
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