the air in any given place
The Earth's atmosphere protects life on Earth.
conducted
To direct the course of
The school principal conducted a school-wide survey to see if they should offer an after school program.
cost
to cause someone to lose or destroy something valuable
His gambling addition cost him everything--his family, his career, and his status.
deadly
causing death or likely to cause death
The toys were recalled because it had been painted with a deadly substance.
decay
to become gradually damaged
Too much sugar in a child's diet can cause teeth decay.
derived
to get or obtain something from something else
The mother derived great pleasure from watching her twins play.
downside
the disadvantage of a situation
San Francisco is one of the most beautiful cities in the world; the downside, however, is that it is very expensive to live there.
electron microscopes
microscope that uses electrons as a way to illuminate and create an image of a specimen
The electron microscope has a higher magnification than an optical microscope which allows for greater observation of small objects.
electronegative
having a negative electrical charge
Atoms that are more electronegative attract more electrons.
give off
to put forth
Roses give off a very strong fragrance.
incidences
the rate at which something happens
With the city budget cuts, there have been higher incidences of burglary.
insulation
any material used to insulate
If your home has inadequate insulation, your energy bill can be much higher in the winter and summer.
odor
an unpleasant smell
Her husband does not like to eat fish because he doesn't want fish odor in the house.
oxidize
combines with oxygen to form another substance
The Statue of Liberty is green in color because the copper has naturally been oxidized.
ozone layer
a layer of air above the Earth, which contains a lot of ozone, and which prevents harmful ultraviolet light from the sun from reaching the Earth
The ozone layer protects humans from the sun's harmful radiation, however, human activity has damaged this layer.
pollutants
a substance that pollutes
Until lead was found to be a harmful pollutant, it was used in paint.
purification
to cause to make pure
After the hurricane, the purification of the water system began immediately.
reactive
reacting to events or situations rather than acting first to change or prevent something
The child's parents tend to be reactive rather than proactive in responding to the child's misbehavior.
refrigerants
cooling or freezing something refrigerants are used in Air Conditioners and refrigerators.
ultraviolet radiation
radiation lying in the ultraviolet range
Too much exposure to ultraviolet radiation from the sun can cause skin cancer.
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