Homework Help: science

Posted by allison on Thursday, February 28, 2008 at 6:15pm.

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 - Anonymous, Thursday, February 28, 2008 at 6:17pm
1. less density?
2. shrink
3. expand
4. the road will crack

i think.

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