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Help!
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| name the three types of bridge design | suspention arch beam
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| how was a clapper bridge build and with what materials | it was an anchint design built with flat rocks and a flat log to go across
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| know the design that the romans built and the materials used to build it | roman arch,natural cement
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| recognize why a bridge might fail | wind rain weathering erosion
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| know the four main goals of an engineer | strong, safe, long lasting, and economical
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| know what x and triangle designs are called | trusses
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| show might a bridge might be harmful to the environment | grassland and farmland are dug up to make way for new bridges
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| ways how people might try to be more enviornmentaly friendly in constuction | soil and sediments are carefully pilled up to protect from erosion
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