1.   A beautiful mountain view could be deadly if it creates a chimney effect, feeding the fire into a frenzy.

2.   A. The odor is the result of a downdraft in the chimney, also known as a reverse chimney effect.

3.   It is called a reverse chimney effect.

4.   The entrances and tunnels were dug at the same level of the natural opening, which prevents air from leaving the cave in a chimney effect.