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Atmosphere and Weather
atmosphere and weather words
21
Science
6th Grade
12/06/2007

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Term

    Weather

Definition
is the condition of Earth's atmosphere at a particular time and place.
Term
Atmosphere
Definition
the layer of gases that surrounds the planet.
Term
Ozone
Definition
 is a form of oxygen that has three oxygen atoms in each molecule instead of two.
Term
Altitude
Definition
 elevation or the distance above sea level.
Term
Pressure
Definition
the force pushing on an area or surface.
Term
Air Pressure
Definition
the result of the weight of a column of air pushing down on an area.
Term
Barometer
Definition
 an instrument that measures a change in air pressure. Two types: Aneroid
Term
Sea Level
Definition
the average level of the surface of the oceans.
Term
Troposphere
Definition
inner most or lowest level of the Earth's atmosphere.
Term
Stratosphere
Definition
extends from the top of the troposphere to about 50km above the Earth's surface.
Term
Mesosphere
Definition
the next layer above the stratosphere.  It is the middle layer in the atmosphere.
Term
Thermosphere
Definition
the outermost layer of the atmosphere.
Term
Ionosphere
Definition
the lower layer of the thermosphere.  Begins at 80km and ends at 550kms
Term
Exosphere
Definition
the outer layer of the thermosphere.  Starts at 550km and extends to outer space.
Term
Isobars
Definition
are lines joining places on the map that have the same air pressure.
Term
Isotherms
Definition
are lines joining places that have the same temperature, (thermometer)
Term
Air mass
Definition
a huge body of air that has similar temperature, humidity, and air pressure throughout it.
Term
Front
Definition
 area where the air masses meet and do not mix.
Term
Cyclone
Definition
a swirling center of low air pressure
Term
Anticyclone
Definition
 are high-pressure centers of dry air.
Term
Meteorologist
Definition

are scientists who study the causes of weather and try to predict it.

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