#9: Collecting Sand or Rocks from National Parks
A handful of pebbles may not seem like much, but multiplied by millions of visitors, the loss becomes significant. That’s why U.S. national parks prohibit taking natural materials home as souvenirs. The rule preserves landscapes exactly as future generations should find them.
provided by constative.com
Rangers often say the best keepsake is a photograph, which captures the memory without disturbing the environment.