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Vocabulary words
science words
31
Science
8th Grade
04/03/2008

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Term

Biodegradeable

Definition
a substance that can be broken  down and recylcled by baacteria and other decomposers.
Term
Carbon cycle
Definition
the system in which carbon is transferd from earths interior to the atmospher oceans crust and living things
Term
chlorofluorocarbons
Definition
one of a group of chlorine componds fromely used in air conditioners and refigerraters
Term
condensation
Definition
the change from a gas to a liquid
Term
decomposers
Definition
a fungi or bacteria that breaks down living thing in to dirt and realeases carbon
Term
drought
Definition
a water shorteg caused by long periods of low precipitation in a particular area
Term
Evaparation
Definition
the procces by wich molecules of liquid water absorb energy and change to the gas state
Term
fertelizer
Definition

chemicals that provide nutrients that help crops grow better

Term
global warming
Definition
a gradual increase in the tempeture of the earths atmosphere
Term
nutrient depletion
Definition
the procces in which plants use more nutrients than decomposers can replace that make the soil less fertale
Term
hazardis waste
Definition
waste that if not disposed of properly can cause harm to the enviroment or cause harm to other poeple
Term
green house gas
Definition
gasses in the atmosphere that trap heat
Term
land subsidence
Definition
a sinking or subsiding of land surface as a result to the geolgic procces caused by human activities
Term
mutalisim
Definition
a type of symbiosis in which both partners benifit from living together
Term
nitrogen cycle
Definition
the procces by which nitrogen is removed from the atnmosphere fixed in the soil by fungi and realeaded back in to the atmosphere
Term
nitrogen fixation
Definition
the procces by wich plants exorb nitrogen and the fungi in the plants roots fix it and relase it back into the atmosphere
Term
nonrenewable source
Definition
a source of energy once used up canot come back
Term
ozone
Definition
a form of oxyegen that hass three oxyegen atoms in each molicule intead of the usual 2
Term
ozone layer
Definition
the lyaer of t he upper atmosphere about 30 kilometers above earths surface where ozone is concentrated
Term
emissions
Definition
solid particles and gases from moter vehicles that are releaed into the air
Term
pesticide
Definition
a chemical intended to kill insects and other orginisims that damag crops
Term
photosynthesis
Definition
the prcces by whic plants absorb the suns energy and creates it own food
Term
precipitation
Definition
when water fall from the sky int the form of ice snow sleet hail or rain
Term
primaryconsumers
Definition
consumers that eat plants
Term
renewable source
Definition
a source once used that will come back over time
Term
sewage
Definition
usaly unders houses i where all the diry water from shower sinks bathtubs and toilets drain to
Term
transpiration
Definition
when palnt take in carbon dixiode and release oxygen
Term
water cycle
Definition
the cycle of wich water goes threough on the earths surface
Term
water pollution
Definition
mainly done by human activities it is when humans dump their wastes or trash into the water
Term
solid waste
Definition
waste like trash that humans burry
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