An earthquake, once described as a great thrashing catfish, is cause by the sudden shifting and colliding of tectonic plates in the Earth's crust. Earthquakes occur without warning, shaking the ground and everything on it. The greatest loss of life during an earthquake is generally due to collapsing buildings. Understanding and preparing for earthquakes can save lives. These Photo Essays look at earthquake-prone areas, geological renewal, soil liquefaction and tsunamis.
Hurricanes gain strength as they move across the open seas, and can be tracked by meterologists.
Weather forecasting cannot prevent the destruction of property and agricultural crops by these storms, but it can warn people and save lives. These Photo Essays reveal the natural forces behind hurricanes and tornadoes. The horse provided the Indians with a source of transportation, greatly expanding their territories. Many tribes became semi-nomadic hunters following the herds of buffalo. These Photo Essays show how some Indian cultures developed, as a result of this mingling.