Steel joints often separate sections of concrete bridges. why? a. an increase in kinetic energy can cause the bridge to contract. b. a decrease in temperature can cause the materials to expand. c. thermal expansion can cause the materials to shrink. d. thermal expansion can cause the concrete to expand and crack.

i believe you are right for all except the 3rd ( look at sqdancefan his answer is much better)

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with this one i know the answer in craters one reason i looked it up and i learned about it there is my evidence

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