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21 Cards in this Set

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  • Back
weather
The condition of Earth's atmosphere at a particular time and place.
atmosphere
The layer of gas that surrounds Earth.
water vapor
The invisible, gaseous form of water.
ozone
A form of oxygen that as three atoms in each molecule instead of the usual two.
pollutants
Harmful substances in the air, water, or soil.
photochemical smog
A brownish haze that is a mixture of ozone and other chemicals, formed when nitrogen oxides, hydrocarbons, and other pollutants react with each other in the presence of sunlight.
acid rain
Rain that contains more acid than normal.
density
The amount of mass of a substance in a given volume.
pressure
The force that something exerts over a given area;also the outward push of a gas against a container divided by the area of the walls of the container.
air pressure
A force that is the result of the weight of a column of air pushing down on an area.
barometer
An instrument used to measure changes in air pressure.
mercury barometer
An instrument that measures changes in air pressure, consisting of a glass tube partially filled with mercury with its open end resting in a dish of mercury. Air pressure pushing on the mercury in the dish forces the mercury in the tube higher.
aneroid barometer
An instrument that measures changes in air pressure without using a liquid. Changes in the shape of an airtight metal box cause a needle on the barometer dial to move
altitude
Elevation above sea level.
troposphere
The lowest level of Earth's atmosphere, where weather occurs.
stratosphere
The second-lowest layer of the Earth's atmosphere; the ozone layer is located in the upper stratosphere.
mesosphere
The middle layer of the Earth's atmosphere the layer in which most meteoroids burn up.
thermosphere
The outermost layer of Earth's atmosphere.
ionosphere
The lower part of the thermosphere where electrically charge particles called ions are found.
aurora borealis
A colorful glowing display in the sky caused when particles from the sun strike oxygen and nitrogen atoms in the ionosphere, also called the Northern Lights.
exosphere
The outer layer of the thermosphere extending outward into space.