posted by allison .
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.
1. less density?
4. the road will crack