Acid rain can damage buildings, stained glass, railroad lines, airplains, cars, steel bridges, and underground pipes.

Migration people get up and go cause they feel it is best for them 

Geothermic gradient is the rate of increasing temperature with respect to increasing the depth in the earths interior. away from tech tonic plates boundaries, it is about 25-40 c/km (72-87 degrees f/mi) of depth near the surface in most of the world.