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Chapter 16-Vocabulary
Atmosphere, winds, clouds, precipitation
43
Science
8th Grade
04/08/2010

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Term
Electromagnetic Waves
Definition
A form of energy that can travel through space.
Term
Radiation
Definition
The transfer of energy by electromagnetic waves. Objects DO NOT touch.
Term
Infrared Radiation
Definition
A form of energy with wavelengths that are longer than red light.
Term
Visible light
Definition
A form of energy that can be seen by the human eye.
Term
Ultraviolet radiation
Definition
A form of energy with wavelengths that are shorter than violet light.
Term
Scattering
Definition
The reflection of light in all directions.
Term
Greenhouse Effect
Definition
The holding of heat by gases in the atmosphere, especially CO2
Term
Thermal Energy
Definition
The total energy of motion in the molecules of a substance
Term
Temperature
Definition
A measure of the average motion of the particles in a substance.
Term
Thermometer
Definition
An instrument used to measure temperature. May contain alcohol or mercury.
Term
Heat
Definition
The energy transferred from a hotter object to a cooler object.
Term
Conduction
Definition
The transfer of heat by direct contact of objects.
Term
Convection
Definition
The transfer of heat by the movement of a fluid.
Term
Wind
Definition
The horizontal movement of air from an area of high pressure to an area of lower pressure.
Term
Anemometer
Definition
An instrument used to measure wind speed.
Term
Weather Vane
Definition
An instrument used to measure wind direction.
Term
Wind-Chill Factor
Definition
The increased cooling that a wind can cause on skin.
Term
Local Wind
Definition
Winds that blow over short distances.
Term
Sea Breeze
Definition
A wind that blows from an ocean or lake ONTO the land.
Term
Land Breeze
Definition
A wind that blows from the land ONTO a body of water.
Term
Monsoon
Definition
Sea and land breezes over a large region that change direction with the seasons.
Term
Global Wind
Definition
Winds that blow steadily from specific directions over long distances.
Term
Coriolis Effect
Definition
The curving of winds because of the Earth’s rotation.
Term
Longitude
Definition
Distance north or south of the equator.
Term
Latitude
Definition
Distance East or West of the Prime Meridian.
Term
Doldrums
Definition
Calm area near the equator where warm air rises.
Term
Horse Latitudes
Definition
Calm areas of falling air, 30o North or South Latitude.
Term
Trade Winds
Definition
East winds that blow from the Horse Latitudes (30o) toward the equator.
Term
Prevailing Westerlies
Definition
West winds that blow North away from the Horse latitudes (30o).
Term
Polar Easterlies
Definition
East winds that blow AWAY from the North or South Pole.
Term
Jet Stream
Definition
Bands of high speed winds about 10 km above Earth’s surface.
Term
Evaporation
Definition
The process of changing liquid water to water vapor.
Term
Humidity
Definition
A measure of the amount of water vapor in the air.
Term
Relative Humidity
Definition
A percentage of water vapor in the air compared to the maximum amount the air could hold at that temperature.
Term
Psychrometer
Definition
An instrument used to measure humidity consisting of 2 thermometers.
Term
Dew Point
Definition
The process of changing water vapor back to liquid water.
Term
Condensation
Definition
The temperature at which condensation begins.
Term
Cumulus Cloud
Definition
Puffy, rounded white clouds.
Term
Stratus Cloud
Definition
Low, layered gray clouds.
Term
Cirrus Cloud
Definition
High, wispy, white clouds made mostly of ice crystals.
Term
Precipitation
Definition
Any form of water that falls from clouds and reaches Earth’s surface.
Term
Rain Gauge
Definition
An instrument used to measure rain fall.
Term
Drought
Definition
Long period of below average precipitation.
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