feitas a guardas florestais nos parques naturais dos Estados Unidos (vou deixar no original em inglês)
GRAND CANYON:
* Was this man made?
* Do you light it up at night?
MESA VERDE NATIONAL PARK:
* Did people build this, or did Indians?
* Why did they build the ruins so close to the road?
CARLSBAD CAVERNS NATIONAL PARK:
* How much of the cave is underground?
O resto aqui
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