Water-saturated sands, silts, and other very [tightly-loosely] compacted soils, when
subjected to earthquake motion, may be rearranged, thereby [losing-gaining] their
supporting strength. When this occurs, buildings may partly [sink-rise up] into the
ground and sand and silts may come to the surface to form sand [explosions-flows].
In effect, the soils behave as [fluids-solids] when liquified. (see fig 3)
Pipelines, tanks and ducts may [float-sink] up through the liquefied sand. Sand
boils can erupt into buildings through utility openings, and may allow water to [build-damage]
the structure or electrical systems. (see Fig 4)