Harriet Ross Tubman was an illiterate slave born in the Bucktown district of Dorchester County on the Eastern Shore of Maryland. She escaped to freedom, alone, in 1849. For the next 11 years she returned to the South 19 times to lead more than 300 slaves north across the Mason-Dixon Line and sometimes into Canada.
HOW DO EARTHQUAKES AFFECT SOCIETY? The earthquake hazard poses the most serious intermediate term risk to the health, safety, and economic viability of many parts of the United States and throughout the world. Recent earthquakes demonstrated the risks to modern industrial societies from such cataclysmic events, affecting everything from massive loss of life, infrastructure damage, and financial instability. Much larger earthquakes can be expected to occur adjacent to many metropolitan regions in the United States. Examples: 1. The Northridge earthquake (1994) was a modest (magnitude 6.7) event which caused 57 deaths, over $20 billion of damage, and created major disruption of the Los Angeles area infrastructure.
An earthquake is the ground shaking caused by a sudden slip on a fault. Stresses in the earth's outer layer push the sides of the fault together. Stress builds up and the rocks slip suddenly, releasing energy in waves that travel through the earth's crust and cause the shaking that we feel during an earthquake.hey mostly occur within 1-2 fault lengths of the mainshock. For the largest earthquakes, this is a long distance; it is thought that the 1906 San Francisco earthquake triggered events in southern California, western Nevada, southern central Oregon, and western Arizona, all within 2 days of the mainshock.