but ...

#1. a piece of granite, a stalk of feather, a few pieces of dried leaves, a gust of strong wind, and a piece of dry land free us from our worries of a forest fire.

#2. a piece of granite, a piece of raw calcium, a few pieces of dried leaves, a gust of strong wind can free us from our worries of a forest fire.

#3. a piece of granite, a piece of gold ore, a gust of strong wind can't create no fire.

#4. two pieces of granite under water, a few pieces of dried leaves, a gust of strong wind, lightning, warm weather can't create sparks big enough to emblaze the whole forest.

#5. two piece of diamond under water, with every other thing dried up, will have their frictional heat lost to the surrounding buffering waters.