This video, courtesy the Illinois Geological Survey, shows how earthquake liquefaction can affect buildings and buried structures. The concept presented is elementary but will provide you a basic understanding of what happens when saturated soils are shaken by earthquakes. The brass weight represents a building or structure and the ping pong ball represents a buried storage tank.
The power symbol has seemingly been around forever. But there’s a distinct reason that it looks the way it does! There’s also more than one power symbol, with each one meaning something different.
