What is the origin of spelunking?

What can you do on a mountain? Why do fish feel a hook in their mouth? What colour clothing is best to wear on a summer night? What wood are bails and stumps made of? What are the pros and cons of a folding umbrella? How does your grass turn green? Is outside a preposition? Do clown fish have an endoskeleton? A500g browning shotgun? How big is mount everist? What is everyday clothing in Argentina? What is a mountain or hill that stands alone? How do you use avert in a sentence? Is a 3030 enough gun for hog hunting? Do you want to take a walk? Where can you buy those adidas pants that everyone has with the white lines around the knees and ankles? What type wood is best to burn in a sauna stove? Will homeowners insurance cover damage to the walkways damaged by trees? What caused the long walk? What do you use the shovel for on scary scavenger hunt?