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Climate and Weather Definition
Ch. 12
33
Science
6th Grade
01/14/2009

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Term
acid rain
Definition
rain that contains more acid than normal
Term
air pressure
Definition
the pressure caused by the weight of a column of air pushing down on an area
Term
altitude
Definition
elevation above sea level
Term
anemometer
Definition
an instrument used to measure wind speed
Term
atmosphere
Definition
the envelope of gases that surrounds Earth
Term
barometer
Definition
an instrument used to measure changes in air pressure
Term
Coriolis effect
Definition
The effect of Earth’s rotation on the direction of winds and currents
Term
conduction
Definition
the direct transfer of thermal energy from one substance to another substance that it is touching
Term
convection
Definition
the transfer of thermal energy by the movement of a fluid
Term
convection current
Definition
the movement of a fluid, caused by differences in temperature, that transfers heat from one part of the fluid to another
Term
density
Definition
the amount of mass of a substance in a given volume; mass per unit volume
Term
global wind
Definition
winds that blow steadily from specific directions over long distances
Term
greenhouse effect
Definition
the process by which heat is trapped in the atmosphere by water vapor, carbon dioxide, methane, and other gases that form a “blanket” around Earth; the trapping of heat by a planet’s atmosphere
Term
heat
Definition
the transfer of thermal energy from one object to another because of a difference in temperature
Term
jet stream
Definition
bands of high-speed winds about 10 kilometers above Earth’s surface
Term
land breeze
Definition
the flow of air from land to a body of water
Term
latitude
Definition
the distance in degrees north or south of the equator
Term
local wind
Definition
wind that blows over short distances
Term
ozone
Definition
a form of oxygen that has three oxygen atoms in each molecule instead of the usual two
Term
pollutant
Definition
a harmful substance in the air, water, or soil
Term
pressure
Definition
the force exerted on a surface divided by the total area over which the force is exerted
Term
radiation
Definition
the direct transfer of energy through space by electromagnetic waves
Term
scattering
Definition
reflection of light in all directions
Term
sea breeze
Definition
the flow of cooler air from over an ocean or lake toward land
Term
temperature
Definition
a measure of how hot or cold an object is compared to a reference point
Term
thermal energy
Definition
the total energy of motion in the particles of a substance
Term
thermometer
Definition
an instrument used to measure temperature , consisting of a thin glass tube with a bulb on one end that contains a liquid (usually mercury or alcohol
Term
troposphere
Definition
the lowest layer of Earth’s atmosphere
Term
water vapor
Definition
water in the form of a gas
Term
water vapor
Definition
water in the form of a gas
Term
weather
Definition
the condition of Earth’s atmosphere at a particular time and place
Term
wind
Definition
the horizontal movement of air from an area of high pressure to an area of lower pressure
Term
wind-chill factor
Definition
a measure of cooling combining temperature and wind speed
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