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Rocks crack because the Sun heats them by day and they:

AMelt at noon
BFloat on water
CTurn to sand
DContract at night
Answer & Solution
Correct answer: D. Contract at night
1. Parts of a rock expand and contract at different rates. 2. Cooling and contraction at night cause cracks. 3. Water freezing in cracks widens them. _Source: syllabus Science, Chapter 14, Natural Resources._
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