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.
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The term sand dollar (or sea cookie or snapper biscuit in New Zealand, or pansy shell in South Africa) refers to species of extremely flattened, burrowing sea urchins belonging to the order Clypeasteroida.
