Landslides can result from a variety of both natural and human causes. Factors that influence landslides include slope angle, climate, weathering, water content of the land, vegetation, geology and slope stability.Know More
Natural causes of landslides include earthquakes, volcanic eruptions, the undercutting of cliffs and banks by water erosion due to tidal waves, and the elevation of pore water pressure by prolonged rainfall and seepage. All of these natural causes are influencing factors of landslides. Together, they can create a small or large landslide that affects the geology and geography of an area.
The human causes of landslides include removal of vegetation, interference with the natural drainage of the land, leaking water or sewage pipes, overloading slopes, mining and quarrying activities, vibrations from heavy traffic, construction or mine blasting, and the excavation or displacement of rocks. Together, human and natural factors can create a landslide. Landslides can be very small and only affect the general ecology of an area, or they can be catastrophic, affecting entire communities by destroying homes and community infrastructures, impacting water and land resources, and even causing fatalities. In the United States, landslides account for approximately 15 deaths every year. Worldwide, the death toll reaches the thousands.Learn more about Earth Science
Landslides often have devastating effects on humans. The wall of mud wipes out buildings, covers roads and changes the landscape. The economic cost of landslides in the United States ranges from $1 billion to $2 billion annually. NBC News reports a death toll of 41 individuals with two missing from the March 22, 2014, landslide in Oso, Washington.Full Answer >
Landslides occur throughout the entire United States, but are more prevalent in certain areas of Hawaii and Alaska and in the Rocky Mountains, Appalachian Mountains and the Pacific Coastal Ranges. Landslides are most likely to happen on oversteepened slopes that fail structurally as a result of snow melting, excessive rainfall, or erosion by glaciers, ocean waves and rivers.Full Answer >
Tar is a derivative of a variety of organic material, commonly consisting of small animals and plants, decomposed by high temperatures and limited exposure to oxygen. This process is referred to as destructive distillation.Full Answer >
Lead is used in a variety of consumer and manufacturing products, including ammunition, batteries, plastics, tank liners, pesticides and some metal alloys. The metal has been used since ancient times.Full Answer >