11 Spectacular Photos Taken By An Astronaut In Outer Space

San Francisco

San Francisco

Much of the densely built-up waterfront around San Francisco sits on landfill, often a blend of rubble and sediment dragged up from the bay. In a major earthquake, landfill is more prone to liquefaction than bedrock: it behaves like a liquid, shaking far more severely, and is more likely to give way altogether.