1. Why will a watermelon stay cool for a longer time than sandwiches when both are removed from a cooler on a hot day? 2. Cite an exception to the claim that all substances expand when heated. 3. An...

1. Why will a watermelon stay cool for a longer time than sandwiches when both are removed from a cooler on a hot day?

2. Cite an exception to the claim that all substances expand when heated.

3. An old method for breaking boulders was to put them into a hot fire and then douse them with cold water. Why does this fracture the boulders?