# science

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?

1. 👍
2. 👎
3. 👁
1. 1. less density?
2. shrink
3. expand

i think.

1. 👍
2. 👎

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