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Cht. 20
I dont know
10
Other
8th Grade
10/10/2007

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Cards

Term
Petroleum
Definition
an oily, flammable liquid
Term
patent
Definition
a government document giving an inventor the exculsive right to make or sell his or her invention for a specific number of years
Term
Business cycle
Definition
the pattern of good times and bad times in the economy
Term
Bessemer Steel process
Definition
a new way of making steel that was developed in the 1850s and caused steel production to soar
Term

Thomas Edison

Definition
Invented firsted lightbulb and phonograph
Term
Generator
Definition
a machine that produces electric current
Term
Alexander Graham Bell
Definition
Invented the telephone
Term
Centennial Exhibition
Definition
an exhibition in Philadelphia in 1866 that celebrated America's 100th birthday
Term
Trancontinental Railroad
Definition

a railroad that spanned the whole continent

Term
standard time
Definition
a system in1918 that divided the united states into four time zones
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