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1.when air is cold, it has less ______.
2.the expansion joints _______ when it is cold outside.
3.the expansion joints ______ when it is hot outside.
4.what might happen to a road without expansion joints?

The _____ is a blank need answer please and 4 need it to be short please. and thankyou for your help.

  • science - ,

    1. less density?
    2. shrink
    3. expand
    4. the road will crack

    i think.

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