## Hydrologic CycleScience brain teasers require understanding of the physical or biological world and the laws that govern it.
Little Johnny, after a science lesson on the laws of gravity, returned home, determined to prove his teacher Mr. Knowles wrong.
"Not everything that goes up comes back down, and I'll prove it!" After some brainstorming, he placed a bowl of water in the 12PM, windless, Sunday sun, and watched as it evapourated. "It all went up," he said. The next day at school, he confronted his teacher about his little science project. But Mr. Knowles told Little Johnny that he was a bit short sighted. How so? ## What Next?
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