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Chapter 2: Weather Factors
Waves, Heat Transfer, Winds, Water Cycle
34
Science
7th Grade
04/03/2012

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Term
Electromagnetic waves
Definition
This is a form of energy that can travel through the vacuum of space.
Term
Radiation
Definition
The direct transfer of energy by electromagnetic waves.
Term
Infrared radiation
Definition
This type of electromagnetic energy has wavelengths that are longer than red light. 
Term
Ultraviolet radiation
Definition
This is an invisible form of energy with wavelengths that are shorter than violet light.  (It also gives you a sunburn.)
Term
Scattering
Definition
This is when sunlight is reflected in many directions.
Term
Greenhouse effect
Definition
The process by which gases hold heat in the atmosphere )which keeps the Earth warm). 
Term
Temperature
Definition
This term means the AVERAGE amount of energy of motion of each particle of a substance.
Term
Thermal energy
Definition
This terms means the TOTAL energy of motion in the particles of a substance.
Term
Thermometer
Definition
Instrument or tool used to measure air temperature.
Term
Heat
Definition
This term means the transfer of thermal energy from a hotter object to a cooler one.
Term
Conduction
Definition
The direct transfer of heat from one substance to another  that it is touching.
Term
Convection
Definition
The transfer of heat by the movement of a fluid is...
Term

Radiation
Definition
The direct transfer of energy by electromagnetic waves is called...
Term
Convection current
Definition
This is the upward movement  of warm air & the downward movement of coo air.
Term
Wind
Definition
The horizontal movement of air from an area of high pressure to an area of low pressure is called...
Term
anemometer
Definition
This tool measures wind speed.
Term
wind-chill factor
Definition
The increased cooling a wind can cause is called the...
Term
local winds
Definition
These are winds that blow over short distances.
Term
sea breeze
Definition
This type of wind blows from water to land.
Term
land breeze
Definition
This type of wind blows from land to water. 
Term
global winds
Definition
These types of winds blow of large areas.
Term

Coriolis effect
Definition
The way the Earth's rotation makes winds curve is called the ...
Term
latitude
Definition
The distance from the equator measured in degrees.
Term
jet streams
Definition
High speed winds that are about 10 kilometers above the Earth's surface are called...
Term
water cycle
Definition
The movement of water between the atmosphere & Earth's surface is called the...
Term
evaporation
Definition
The process by which water molecules in liquid water escape into the air as water vapor.
Term
humidity
Definition
This is the measurement of the amount of water vapor in the air.
Term
relative humidity
Definition
The percentage of water vapor that is actually in the air compared to the maximum amount of water vapor that the air can hold at a certain temperature.
Term
psychometer
Definition
This is a tool used to measure relative humidity.
Term
condensation
Definition
The process in which water vapor changes to the liquid form. 
Term
dew point
Definition
The temperature at which water vapor condenses.
Term
cirrus
Definition
A cloud that forms at high altitudes & looks wispy or feathery.
Term
cumulus
Definition
This type of cloud looks fluffy and usually indicates fair weather.
Term
stratus
Definition
This type of cloud forms in flat layers.
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